1993 d350 2wd auto, 140,000 miles. Lift pump went out, replaced with 2nd gen piston pump last year, ran fine since. VE pump looks to have been replaced as it is painted black, dont know.

Was going up i-80E to Truckee, as I get close to summit I noticed egts climbing, eng temp climbing, I coast down back of summit into truckee, oil pressure drops, brakes get goofy... I pull over and shut it down. Check oil and it was waaaay over full, thin and stank of diesel. Had it towed 90 miles back to house. Draining the oil out last night and it is almost straight diesel, light grey thin and transparent, filled one 15 qt conatiner and had to stop, still lots of oil/fuel left in pan... need to buy another container to drain the rest into.

As i was cleaning up top of container I see this broken piece of metal in oil, looks like half of a small steel washer, looks like its a bit chewed up maybe. Trying to post a pic. Anybody have a guess what this piece is, where it came from and why? I fear Something inside my engine is coming a part.

 

Lift pump failed. That is part of the stem retainer that the lever pulls against. When that lets go the diaphragm leaks fuel into the block.

 

Diaphragm pump went out last year and I replaced it with ds3936320 piston pump. Can piston-style pump leak fuel into block?

 

I have not heard of a piston pump leaking fuel in the block.
When was the last time you checked you oil level?

 

Last i checked oil level was within 1k miles ago, level was perfect

 

Well how long ago was that in comparison to when you put the 2nd gen LP in, a year ago??

 

You may have pushed the front seal out on the injection pump.
Is it a special Low pressure LP or just a stock 2nd gen LP that will run at a pressure that is too high for the VE pumps front seal to hold?

 

It was probably a few thousand miles after doing lift pump

 

Pump is part# ds3936320, supposed to be low pressure similar to old diaphragm pump.

Is there way to check HP pump for blown seal w/o doing major surgery?

 

My guess would be no. There is no diaphragm just a piston with o-rings. If an o-ring fails it may seep fuel but nowhere near what you got.

Edwin

 

If the fuel is not coming from the LP [which seems very unlikely with a piston pump] my guess is in is coming from the injection pump seal.

Did you verify the fuel pressure after the LP swap?

 

I did not verify pressure, I do have full set of gauges including fuel pressure gauge in box on my bench.......

 

Auburn ca? Would you be the guy I met at the Veterinarians Tuesday?

Never mind he has a D250.

 

My dog wont go to the vet, says its against his religion

 

Now I am curious I can think fo four D 350s around Auburn. A white one with the typical leper dodge paint, a really clean white one , a really clean red/light grey one and a really clean blue/ light grey.one. rare one of these yours? I forgo there is a faded grey one too.