Injector Pump Problem?

Hello Everyone,

I have an old 82 VW diesel engine that won't start. It had been sitting for approximately 15 months. It seems to be a fuel problem. I've replaced the fuel lines at the tank as they were leaking thinking the system might be sucking air in. Did not solve the problem. Tried bleeding the system by removing the fuel lines to the injectors as per bentley's manual but no fuel even trickled out while turning the motor over.

And now for my question......

I removed the fuel line from the fuel filter and cranked the engine over hoping to feel a vacuum in the line but I felt nothing. Does this mean my injector pump is bad? Anything else to look for? I do hear the "stop fuel" relay clicking in the pump for what that is worth.

Sorry for the long blow by blow account but I wanted to ge the facts out. Also I replaced the fuel in the tank and the fuel filter during my tank lines replacement...

TIA

WhiteDog

Reply to
WHTDOG469
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I've heard some folks on the VW-DIESEL mailing list suggest using a bottle and hose to feed fuel to the pump, keeping the bottle at a higher level than the pump. If this doesn't work, then something is wrong inside the pump, but if it does work then its either a weak transfer pump or an air leak or clog somewhere between the tank and pump.

Reply to
Roger Brown

Your pump lost it's prime. Also you've had the entire system open and a 20 year old pump does not have much of a chanch of sucking that heavy diesel from the tank to the engine. Normal reason for loosing prime is a worn seal on the pump shaft. The seal is replacable. What you need to do is prime the pump. I do it with a gasoline fuel pump available from a autoparts store($30-$40). The flow and pressure rating is not important. Insert the pump at the intake to the filter. It will take the pump about 5 mineuts to prime the system. Then loosen injector lines as per bently. When VW first introduced their diesel back in the 70's there was talk about the pump never being designed to pump the fuel all that way. On the 1977 Rabbits there was a plunger pump on the fuel filter bracket for just your problem. They desided it was not necessary and stopped putting them on. You can mount the pump permently and hook the positive wire from the pump to the stop solenoid on the injector pump.

Reply to
Jo Bo

Remove the pump return fuel line and fill the pump to the top. This should be enough to get it going.

Reply to
Woodchuck

Much thanks to Roger Brown, Jo Bo and Woodchuck.

I poured fuel into the fuel line to prime the pump. I then turned the motor over w/ each of the lines to the injectors opened while refilling the fuel line. I then made sure the filter was as full as possible and the motor started. You guys were right on the money and I truely appreciate it. Thanks for your suggestions.

WhiteDog

Reply to
WHTDOG469

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