Questions --Thread from "24flys" "IT WON'T START"
 

Trying to get my 1974 914-4 1.8L to run after rebuild of body, interior. Read the thread to "24flys". The relay board seems fine (the heater blower works) but the fuel pump won't work. Put tester on leads to fuel pump and there is no reading. Started to go through the trouble shooting found on http://members.rennlist.com/pbanders and have no idea what the AAR, FP or H are.
Will the fuel pump stop running if the fuel level in the tank gets too low? Does the hose size make a big difference? Didn't use metric sizes and purchased the closest american size for the fuel system and all the hoses in the engine comparment

try putting a jumper wire from your battery to your fuel pump. if it works your fuel pump should be good and your problem is somewhere else.

scotty

First, the 1.8 uses the L-jetronic FI system, which is different from the D-jetronic system covered on Brad Anders' site.

The AAR is the Auxiliary Air Regulator. The FP is probably the Fuel Pump. I don't know what "H" would be. The 1.8 does indeed have an AAR and an FP.

Note that the 1.8's fuel pump does not do the ~1.5 second "prime" that the D-jet one does. Instead, it runs either when the starter is cranking, or when the flap in the air flow meter is moved. You can turn the key to "on" and reach into the AFM (Air Flow Meter) and push the flap with a screwdriver to hear the pump run, if the system is working.

The 1.8 uses a "double relay" that hangs off the relay board to power the FI and the fuel pump.

Check over at http://www.type2.com , as the later Buses used an L-jet system very similar to the 1.8s and their FI tech articles should also apply to you.

--DD

Thanks for the information. Will try the jumper and check over the web site.