I've got a question on the fuel tank. I'm trying to hook up the new diesel engine to the old gas tank in the '91 GTI, and I can't get it to stop sucking air into the fuel line. The tank is half full of biodiesel, so that shouldn't be the problem. I took out the fuel-pump/filter/accumulator under the back of the car and plumbed the supply and return lines straight through. In the engine compartment I have a small electric fuel pump, then of course the one built into the IP. The problem is that it is drawing air into the supply line (seems to deliever about half air and half fuel), which eventually airlocks the engine. If I dip the hose under the back of the car into a jug of fuel instead of the line coming down from the fuel tank, it works fine, so it must be somewhere right after the fuel tank, or in the fuel tank somehow.
For now, I've got a 2 gallon jug of fuel in the engine compartment, but that's certainly not a long term solution. Is there some design feature of these fuel tanks that I'm missing, or should I just drop the fuel tank and see if something got screwed up on the fuel line coming out? There is a third line coming up, which I think was part of the evaporative emissions system. Do I need to cap that off maybe?
Topic: Fuel tank problems (Read 4036 times)
