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diesel fuel on back of block

893 Views 4 Replies 2 Participants Last post by  baker1931
on my 1981 VW pickup 1.6l diesel when I try to start it there is a leak of diesel fuel somewhere on the back left side of the motor. ????????
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Back side could be from the Return fuel or incoming fuel, but I would be looking at the fuel lines and Banjo-bolts. Return line is under pressure where as the incoming isn't under pressure.
Thanks---will try today----Would this leak be my problem to keep the engine running. If I fill the injector pump up the engine will run until the pump is empty?
Diesels don't like any air in the Fuel lines, and a leak will allow air in.
If you can fill the Pump with fuel and it runs until dry, what is your Clear Line Showing?.

As the Pumps get weak, and won't draw any fuel that is a issue too and they usually have to be rebuilt or you can add a "helper" pump to draw the fuel out of the tank.

If your tank's Sump or Swirl pot is broken or the Tanks inlet filter screen is Dirty that is also a issue with Fuel delivery as there is a screen inside the tank that can get plugged and stop fuel from flowing to the pump.

So if you take a 2 liter bottle and place fuel in it and allow the engine to draw fuel from it and it runs till empty, then you are looking at a Bad Filter or Tank issue ....Or a weak injection pump.

If you have taken off your "Banjo" fittings and either didn't re-condition the seals or replace them then they will leak.
To re-condition them you sand the burr's down and make them Shiney.... Hold them over a flame until they change to a dull color. They then should be good to go. My Local Napa, and a few injection pump rebuilders have them.
There are 2 sizes, I can't remember the diameters, but using the etka you can find the PN and go from there.

So you have possibly 2 issues, a leak and possibly a clogged inlet.
Get the Leak fixed first as that will tell you more about the delivery issue.
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Thanks going to work now!!!!!!
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