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Revised January 16th, 2013

Fuel Injection

Type 2 1974 through 1979


Most of the electronic Fuel Injection components on your Bus are manufactured by Bosch. However, many of the other necessary components such as hoses, seals, air cleaner parts, etc., are manufactured by the respective OE manufacturers to Volkswagen, such as Continental, LMB, Goetz, Elring, etc. We have endeavored to supply as much OE components as is possible to obtain from sources both here in the United States and in Europe. Quality is our first priority when stocking and selling parts for fuel injection because it can be a major investment, even when replacing a relay. Below is our comprehensive list of replacement parts for the L-Jetronic Fuel Injection System on your 1974 to 1979 Bus or Westfalia. Please note that where there are split years in certain components, we have provided your VIN Number, or in the case of a Bosch component within split years, the Bosch number in Parentheses ( ).

Rebuilt Item Cores are subject to inspection according to our Core Policy. Please read our core policy by clicking here: Bus Boys Core Policy

Air Filter Element 

Air Intake Elbow Boot

Air Flow Meter

Auxiliary Air Valve

Auxiliary Air Supply Valve

Cold start Valve

Decelerator Valve & Related Parts

Electronic Control Unit (ECU)

Fuel Filter

Fuel Injectors

Fuel Injector Seal Kit

Fuel Pump

Fuel Pump Relay

Gasket Block - Air Intake Runners to Cylinder Head

Hoses

Oxygen Sensor

Pressure Regulator - Fuel

Resistor Unit

Temperature Sensor

Thermo-Time Switch

Throttle Switch

FI Harness Repair Parts 


Air Filter Element - Mann or Mahle

Air Filters are very critical in determining how well your fuel injection runs. Too clogged up and the Air Flow Meter (Air Box) as well as the engine doesn't get enough air. In my opinion, filter elements should be changed every 10,000 miles, more so if you frequently drive in dusty conditions. Up until recently, we have been selling the German Mann units. Lately, our importer/supplier has been shipping Austrian Mahle, which is a division of German Knecht, an original supplier to Volkswagen. In addition, we have recently added K&N Filter Elements to our product line.

039-129-620A  1974 Calif. Automatic  $13.50

021-129-620  1975-1979  $9.70

ZAP-13772  K&N Filter Element 1975-1979  $59.07


Air Intake Elbow Boot

Runs between the Air Flow Meter (Air Box) and the Throttle Body. Old ones are usually cracked, allowing vacuum leaks that can be difficult to track down if you don't know this.

022-129-967AC  1975-1979  NLA


Air Flow Meter - Rebuilt (Also called the "Air Mass" or "Air Box")

AFM's, or Air Boxes as some people call them, if left alone usually last a long time. There's a flap inside that swings around letting air in as the throttle body wants it and the flap attached to a potentiometer that sends the appropriate signals to the ECU in regards to air flow amount. The potentiometer wipes across a circuit board and that can wear as well over time with constant use. Another common malady is if you have backfiring coming through the intake for various reasons, it can bend, crack or blow apart the flapper. Engine heat can also dry the teeny bearings the flapper shaft rides on, causing it to jam or bind up, restricting the air flow. It is highly recommended that when installing a new (or rebuilt) Air Box, that you have a mechanic with a CO "sniffer" fine-tune the Air Bypass screw (or allen on some) that's off to the side for optimum running. Don't fool with this yourself or you might have a heap o' problems.

Air Flow Meter - Rebuilt - Exchange

Our Rebuilt Air Flow Meters are completely gone through and our experience on our own Buses & Vanagons with these have been exemplary. Warranty is 6 months.

022-906-301CX  1974 Calif. Automatic  $207.75  PLUS $75.00 Core Charge

022-906-301AX  1975-Early 1976 (0280 200 012)  $207.75  PLUS $75.00 Core Charge

022-906-301BX  Late 1976-1977 (0280 200 018)  $212.34  PLUS $75.00 Core Charge

022-906-301DX  1978-1979 (0280 200 020)  $235.97  PLUS $73.00 Core

039-906-301X  1978-1979 (0280 200 022)  $309.68  PLUS $73.00 Core

Note: Be sure to note the Bosch Number on your original Air Flow Meter. If the number on yours does not match the list above, please call us to properly interchange it for you.


Auxiliary Air Valve

022-906-045A  1974-1979 NLA


Auxiliary Air Supply Valve

022-906-047A  1974-1975  $83.72


Decelerator Valve & Related Parts

Also called a Vacuum Limiter, its that disc-shaped object theair intake elbow boot connects via the large vacuum hoses to, just to the left of the center air plenum. When the diaphragm inside cracks, there's a heck of a vacuum leak.

A. Decelerator Valve

022-133-551A  1975 Manual Trans - NLA

022-133-551B  1976-1978 Manual Trans -  NLA

022-133-551C  1976-1979 Automatic - NLA

039-133-551C  1979 Calif. Manual Trans - NLA

039-133-551B  1979 Federal Manual Trans - NLA

B. Hose, Valve to Plastic Tube

N 20371.03  75-79 Manual Trans  $1.00

C. Plastic Tube, Valve to Rubber "Y"

071-133-086  1975-1979 Manual Trans  NLA

D. Rubber "Y" from Center Plenum to Plastic Tube & Power Brake Vacuum Hose

022-133-083  1975 Manual Trans  NLA

022-133-083D  1976-1979 Manual Trans  $22.36

(Not Shown) Rubber Connector From Center Plenum to Power Brake Vacuum Hose (Goes in the same place as D above, but for Automatics.

071-133-083  1976-1979 Automatic  NLA

E. Hose - From Air Intake Elbow Boot To Decel Valve (Molded)

022-201-919  1975-1979  NLA
(Note: There is a non-molded substitute for this-you can use 3/4 inch smog hose from your local parts store - cut to about 13 inches long. Original stuff is 18mm ID which is just a tad smaller than 3/4", so clamps are recommended.)

F. Plastic "Y" Insert - From Air Intake Elbow Boot to Decel Hose (E) and Aux Air Valve Hose

022-133-215A  1975-1979  NLA

G. Plastic /Was Metal Insert, From Air Intake Elbow Boot to Oil Breather Hose

025-133-199  1975-1979  $2.75


Electronic Control Unit (ECU) - Rebuilt - Exchange

Bosch is currently obsoleting many models of ECU's. Therefore, we have been sourcing these from an independent remanufacturer for the past few years and the quality meets or exceeds the Bosch quality. In fact, we've only had one defect in 2 years, so that has to be a pretty good track record. Many of them are very affordable, compared to Bosch's original pricing on those obsoleted and even those still available from Bosch. Warranty is 6 months.

California Models:

022-906-021KX  1974 Automatic  $400.00 PLUS $110.00 Core

022-906-021LX  1975 Manual Trans  $400.00 PLUS $110.00 Core

022-906-021MX  1975 Automatic  $400.00 PLUS $110.00 Core

022-906-021QX  1976 Manual Trans  $400.00 PLUS $110.00 Core

022-906-021RX  1976 Automatic  $400.00 PLUS $110.00 Core

022-906-021AAX  1977 Manual Trans  $400 PLUS $110.00 Core

022-906-021ABX  1977 Automatic  $400.00 PLUS $110.00 Core

022-906-021AEX  1978 Manual Trans  $400.00 PLUS $110.00 Core

022-906-021AFX  1978 Automatic  $450.00 PLUS $110.00 Core

039-906-021DX  1979 Manual Trans  $400.00 PLUS $110.00 Core

039-906-021EX  1979 Automatic  $395.00 PLUS $110.00 Core

Federal Models:

022-906-021HX  1975 Manual Trans  $400.00 PLUS $110.00 Core

022-906-021JX  1975 Automatic  $400.00 PLUS $110.00 Core

022-906-021NX  1976 Manual Trans  $400.00 PLUS $110.00 Core

022-906-021PX  1976 Automatic  $400.00 PLUS $110.00 Core

022-906-021SX  1977 Manual Trans $400.00 PLUS $110.00 Core

022-906-021TX  1977 Automatic  $400.00 PLUS $110.00 Core

022-906-021AGX  1978 Manual Trans  $400.00 PLUS $110.00 Core

022-906-021AHX  1978 Automatic  $400.00 PLUS $110.00 Core (Core must be sent in ahead to be rebuilt)

039-906-021BX  1979 Manual Trans  $425.00 PLUS $ 110.00 Core

039-906-021CX  1979 Automatic  $400.00 PLUS $110.00 Core


Cold Start Valve

Often called the "5th Injector", it injects more fuel into your center air plenum when your engine is cold. Sort of a "choke system" for fuel injection. Operated by the Thermo-Time Switch, these rarely go bad. The only time they should be replaced is if they leak fuel or if the solenoid inside sticks or no longer functions.

022-906-171B  1974-1979  $180.00


Fuel Filter

The heart of your fuel injection system is the fuel filter. Once they become dirty and plugged, engine performance suffers and too little fuel getting to the fuel pump can cause the pump to seize. Both shown are the original style plastic square filters. Never run a filter designed for carburetion on your fuel injection!

311-133-511D  1974 Calif. Automatic  $8.45

133-133-511  1975-1979  $9.00


Fuel Injectors - New - Genuine Bosch

Fuel Injectors can become clogged over a period of time or after a large amount of miles. Many people do not realize how sensitive these beasts can be. If loaded with junk, they can run either rich or lean, depending on where the junk is.  The art of keeping these clean is to regularly change your fuel filter and run a fuel injector cleaner at least once a month in a tank of gas.

023-906-031  1974-1979  $175.00 each

Fuel Injectors - Rebuilt - Exchange

Now available as a quality remanufactured unit, these can make changing out your injectors a little more affordable and a little less painful. Warranty is 6 months.

023-906-031X  1974-1979  $61.00 each PLUS $15.00 Core each


Fuel Injector Seal Kit

Contains 4 large and 4 small injector seals.

311-198-261A  1974-1979  $7.35 kit


Fuel Pump - Electric - New

New electric fuel pumps are available now from two sources - Bosch and A.P. Pierburg, both German manufactured. Quality is of course excellent. Warning! Never run an electric fuel pump dry as it will cause it to overheat and seize up. The fuel acts as a coolant for the fuel pump, so this is very important to keep in mind. In otherwords, don't run outa gas!

022-906-091A  Bosch, 1974 Calif. Automatic  $442.00

251-906-091  Bosch, 1975-1979  $270.00

251-906-091 GR  Pierburg, 1975-1979  $260.00

Fuel Pump - Electric - Rebuilt - Exchange

Now available as an affordable rebuilt, we feels these pumps are as good, if not better than Bosch new ones. Warranty is 6 months.

251-906-091X  1975-1979 $156.00 PLUS  $50.00 Core


Fuel Pump Relay (Also called the "Combi-Relay")

Burnt contacts in these can sometimes cause failure of the fuel pump or just the relay itself. These aren't cheap. Thoroughly test your old one using the Bentley Manual troubleshooting guide before ordering, because Bosch will exchange, but not refund the cost of this relay if it's suspected to be defective. 8 out of 10 relays returned in the past 5 years proved to be just fine, so check your old one thoroughly first! By the way, of the 2 that were bad, there was 1 that Bosch heavily suspected that the person trying to replace it rewired their connector wrong, thus heavily burning it out. If you have to rewire the connector(s) because it has fallen apart, please triple check the wiring in your Bentley Manual, testing the beginning and end of each lead. There are two types of relays, so note the number of terminals so you can get the right one the FIRST time.

071-906-059  1975 to 1978 California, 1979  Federal with 11 terminal relay  $104.15

071-906-059A  1979 California w/13 terminal relay  $90.00


Gasket Block - Air Intake Runners to Cylinder Head

022-129-707F  $9.90 each


Hose/Boot - Center Air Plenum to Air Intake Runners

These are those large diameter hoses that connect the center plenum to the individual intake runners going to each cylinder. Cloth braided original German is what we carry and 4 are required per Type 2. A notorious spot for vacuum leaks.

039-133-241  1974-1985  $5.30 each

Hose - From Air Intake Elbow Boot to Aux Air Control Valve

N 20374.08  1975-1979  $2.00 (Hose Pre-Cut To Size)

Hose Elbow - Aux Air Control Valve to Hose above

022-129-637  1974-1979 $4.00

Hose - Aux Air Valve to Center Air Plenum

022-133-127  1974-1979   $2.75

Hose - Fuel High Pressure

Genuine Continental 7mm High Pressure Fuel Hose with smooth covering, no outside braided cloth. Our opinion is that this a much better hose than the original braided hoses you find on the some of the FI Buses. Sold by the foot, not the meter like some other places. 12 to 15 feet usually does the engine compartment, supply lines and return lines, depending on the year.

N 20281.12  1974-1979  $4.90 per foot
(Note: We do carry the cloth braided variety for the fanatics - order N 20357.12 $2.95 per foot.)


Oxygen Sensor - Genuine Bosch

California 1979 models did use an Oxygen Sensor. How do you tell a California Model from a Federal Model? Take a look at where the Catalytic Converter is. If it's on the left side, next to the left Valve Cover, itsa California model. If it's in-line with the muffler out by the bumper, then itsa Federal model. Oxygen Sensors tell the ECU when to lean or richen your fuel mixture at the injectors by sending a small voltage signal in relationship to the presence of oxygen in the exhaust. Too much oxygen, it richens the mixture. Too little oxygen, it leans it out. A heavily sooted and carbonized probe won't allow the sensor to send a proper voltage to the ECU, usually making the engine run too rich, resulting in poor mileage and fouled spark plugs. Because Air Cooled engines (especially Bus & Vanagon 2 liters) run so hot, I recommend replacing them at least every 50,000 miles. What we carry is the Universal Bosch Sensor. This sensor looks just like your original except it doesn't have your standard long wire and connector. It has just a little pigtail wire with a crimp connector. Simply cut the existing wire off your old sensor, strip about a quarter inch off the insulation and then crimp that end onto the pigtail crimp connector. There - you just saved about $50 bucks for the real thing, which is also available from Bus Boys as well. Remember - California 1979 models only.

035-906-265 UN  Universal Oxygen Sensor, Bosch  $29.75

035-906-265  Oxygen Sensor w/Factory Connector, Lead and Grommet, Bosch  $150.00


Pressure Regulator - Fuel - Genuine Bosch

022-906-035  1974-1979  $124.60


Resistor Unit (Also called the "Series Resistance Block")- Genuine Bosch

The Resistor unit is located in the left-hand side of the engine compartment, on the fuel tank compartment cover, just above the Fuel Pump (Combi) Relay. A portion of it, through the FI wiring harness is connected to terminal 88b of the Fuel Pump Relay and helps control the resistance in the FI electrical system. An item that doesn't fail too often and when it does it's usually from an overheated engine compartment. Not used on 1979 California Models, the resistance is built in to the harness and ECU on those models.

022-906-079  1975-1978 All States, 1979 Federal  $121.00


Temperature Sensor - Cylinder Head - Genuine Bosch

Another handy device that's actually a transducer, sending the temperature signals to the ECU to adjust your fuel mixture. When they go out - the engine don't run. Quick fix for this if out on the road and without a spare is to hook a jumper wire to the sender at the head with a test light - hook the other end to the wire that connects to the harness and should offer some connection and resistance to allow the engine to run - not that great - but it will get you to the next pit-stop to find the real thing.

022-906-041  1974-1979  $22.25


Thermo-Time Switch

This operates your Cold Start Valve. When your engine is stone-cold or in cold conditions when your engine is warm, there is a temperature controlled probe that samples the ambient air temperature in the engine compartment. At certain (i.e.: cold) temperatures, it completes the electrical circuit to your Cold Start Switch to operate it. After the engine is started, the ECU disconnects the power to the Thermo-Time Switch, shutting the electrical current off to your Cold Start Valve. While the engine is running however, the temp probe is still measuring the ambient temperature and also keeps the switch off if above a certain point. This is why your cold start valve should not work in warm temperatures or when the engine is still warm. Consult your Bentley Manual for temperature ranges.

311-906-163C  1974 Calif Automatic  $59.33 (See Note below)

043-906-163  1975 Only  $61.61 (See Note Below)

043-906-163A  1976-1979  $68.70

1974-1975 models not normally stocked and must be special ordered - approximately 3 days lead time at the worst. These are VERY SLOW movers which is why we do not stock them on a regular basis. Bosch has indicated these will be obsoleted very soon.


Throttle Switch - Genuine Bosch

022-906-111G 1974 Only - No Longer Available

022-906-111E 1975-Early 1976 - No Longer Available
(Note: Bosch and VW obsoleted these in 1996 - Call for good used.)


NEW! FI Harness Repair Parts

We have recently introduced the following items to aid in the repair of your FI Harness, particularly dealing with connnectors and terminals. We get dozens of calls every week looking for the complete connectors to repair existing harnesses. Unfortunately, many of these connectors only came with a new harness, with a few exceptions. In many cases, all that's needed to repair the harness are the "flat" spring-loaded connector terminals, which have been very difficult to find. These are brand-new, not used or reconditioned connectors. The following are the connector housings and special terminals we now have available, including the tool to work with them.

2 Pin Connector Housing

FI Contact Terminal With "Pigtail" Wire

FI Harness Pin Tool

Clip For 2 Pin Connector Housings

2 Pin Connector Housings

Fits Injectors, Thermotime Switch, Cold Start Valve and Aux Air Valve. Comes as the Housing only (Re-use your harness and terminals) or pre-wired with contact terminals and short "pigtail" wires for reconnection to your harness. VW has obsoleted these numbers for sometime now.

022-906-231A  Connector Housing With Clip  $6.15 each

022-906-231AK  Connector Housing w/terminals and pigtail wires and clip $7.80 each


FI Contact Terminal With "Pigtail" Wire

Fits the above Connector Housing, as well as a number of FI Multi-Pin Connectors and the connector to the Electronic Ignition Module on 1979 California Models.

357-971-741AW  Contact Terminal w/Pigtail Wire  $1.65 each


FI Harness Pin Tool

A handy tool to have when replacing the contact terminals above in almost any of the FI Harness Connectors

ZVT-90601  FI Harness Pin Tool  $2.95


Clip For 2 Pin Connector Housings

This clip keeps the connector housings attached to your Injectors, Thermotime Switch, Cold Start Valve and Aux Air Valve. Without these, engine vibration can sometimes cause the Connector Housing to come loose, even fall off what its attached to.

022-971-999  Clip, Connector Housing  $1.25 each


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