Gas in Oil!?

hack_man · Mar 4, 2025

ChuckN said:
You mentioned a glass fuel filter- get rid of that pronto. They are famous for cracking and starting engine fires.

I also learned the hard way never use plastic fuel filters, always get the metal can. I drove my truck to the garage for its yearly emission test with gas spurting under the hood as I drove into the shop. I was so lucky it didn't start an engine fire. I replaced it with a metal one in the parking lot and will never use a plastic one again.

Tonimus · Mar 4, 2025

PrairieDrifter said:
What was the engine condition? Higher rpm with higher crankcase pressure and more oil flow, the pump instead of pushing fuel in, was sucking oil out from the same path.

No, it had to be loaded up. 3k rpm in neutral wouldn’t do anything. Engine runs great. Has a properly functioning PCV system too.

YakkoWarner · Mar 4, 2025

hack_man said:
I also learned the hard way never use plastic fuel filters, always get the metal can. I drove my truck to the garage for its yearly emission test with gas spurting under the hood as I drove into the shop. I was so lucky it didn't start an engine fire. I replaced it with a metal one in the parking lot and will never use a plastic one again.

Can you get just a generic metal can filter with a simple barb on each end? My current British project has the glass filter (and currently only gets run from a boat tank). I want to swap it with a metal filter. Without knowing an "application specific" part number finding just a generic has been tricky.

hack_man · Mar 4, 2025

Mine was something like this gas filter, just not the exact same PN
Yes metal generic can with simple barb on each end

The problem with plastic is over time it becomes brittle and cracks as I found out.

That was the second time I brought my truck in for an emission inspection and I was told to get the $H$$!! out of the shop. The first time it was exhausting such a high level of hydrocarbons it stunk up the shop and choked everyone while running the tail pipe sniff test, the second time it was dumping out raw gas from the busted filter.

Evidently my truck doesn't like to be smog tested and feels the need to retaliate :Nonono:

gas filter

Barrett-FL · Tuesday at 10:14 AM

Update on Gas in Oil issue:

After draining the oil (and gas in the oil) and the oil filter, I replaced the mechanical fuel pump and the engine starts right up and runs well with no issue...and...after several days it will start right up which was a problem before due to fuel draining back from the fuel filter.

It appears the diaphragm had failed causing the issue.

As Tonimus stated: "This may be a two birds with one stone scenario".

Thank you to all who responded in efforts to assist. I appreciate it and will have more questions as this project continues.

Gas in Oil!?

hack_man

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Tonimus

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YakkoWarner

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hack_man

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Barrett-FL

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