Quote:
Originally Posted by e9coupe
I remember now that I inspected the sending unit a while back and drove the truck with the unit removed to test the suction issue. No change in the problem and the fuel level unit works correctly.
The strainer is interesting since it's a few inches tall, but the problem starts at the 2/3 level or so which I would think is well above the strainer. I think the weight of the fuel may play a role in why it does it with less fuel, either by helping it get through the strainer or helping the lift pump work better.
I'm getting ready to tear the whole truck apart and do a "refresh" on the chassis and drive train. I wanted to figure out the fuel issue first but I may just pull it all apart and see if I can find anything then. If I have to fix it after I put it back together, oh well.
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Put like a 2-liter container of diesel fuel under the hood and see if it runs fine off of the 2 liters of diesel.
Concerning the fuel pump pressure test you need to read up on that. Even with a liquid filled pressure gauge the needle vibrates too much to read. There are threads where there are 2 methods to deal with that.
Also, you need to know a place to hook up the gage.