Question about 1983 Volkswagen Rabbit Pickup

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1980 VW rabbit, manual/fuel injection: I am

1980 VW rabbit, manual/fuel injection: I am original owner. Problem started few years ago & has been getting worse. Apx 110,000 miles.
Starts & runs OK when cold. Starts & runs OK when warm.
Idles & runs fine, like new.
Gas mileage getting worse.
No noticeable leaks or smells.
compression is OK. No oil loss or oil burning.
When engine is warm and left off for anywhere between 20-minutes or so and 4 hours or so, it is very difficult to restart. It will catch briefly, then stall, and then refuse to start without huge amounts of cranking (with rest periods). I checked entire ignition system, everything seems fine. Replaced points, plugs, plug wires, rotor, cap. Cleaned coil towers. Reset dwell & timing -- no change. I tried installing a jumper switch
& test light to run the fuel pump when engine is off and monitor pump
when engine is on. Pump runs properly when engine is on or cranking.
If I run the fuel pump for apx 30 seconds (with the bypass switch) when the engine is hard to start -- then it will start but run poorly for apx 10 seconds and then run OK.

I am suspecting either the accumulator or the fuel pump check valve but I don't understand why it starts & runs OK when cold. Am I on the right track? What to do??

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It starts from cold because the auto choke is on ,allowing a richer mixture ,try removing the sender unit in the tank and seeing if the connection from the pump to the outlet connection is ok or leaking causing a loss of fuel pressure

Posted on Aug 02, 2009


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