Question about 1988 Isuzu Pickup 2WD

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While my 88 isuzu is running or when you shut it off, oil pours out the vent tube coming off the fuel pump... why is this happing and what can i do to fix it?

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On old engines you get "blow by" compression past the rings which no longer seal to the cylinder walls. This crank case pressure often times causes oil to pump through the PCV and collect in the air filter box. You may have the same situation going on. Makes sure any provided crankcase venting is working.

Posted on Apr 01, 2011

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Sounds to me that you are getting oil in you fuel, I would take and get pressure tested to see if any crack's in head or block. Good luck.

Posted on Apr 01, 2011

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This is a maddening problem if you don't know what's going on. If it's like my 92 isuzu pickup with 2.3 litre engine, it's a vent line coming out of the fuel pump which will spit oil out. I had a very hard time figuring out why but finally read that there is a galley in the block where oil runs back to the oil pan. If it gets clogged, oil will come out the vent line of the fuel pump. I even took my head off and tried blowing compressed air and sticking various wires through the block holes near where the fuel pump mounts. Nothing did any good and I was sick of the leaking oil and having to add oil so I bought several feet of oil resistant hose at autozone and routed it from the vent line, back over the engine, and into the dipstick tube. This worked like a champ. No more leaking oil. No more adding oil. Make sure you trim the outside of the hose where it goes into the dipstick with a razor knife or similar, so it will fit tightly. Make real sure you use oil resistant hose or it will break down and get into your oil. Not good. Then use a tie wrap to secure the hose to something else like the brake vacuum hose to keep it in place. I keep my dipstick behind the seat and make sure it's cleaned before and after checking my oil. This truck doesn't use any oil to speak of now and I wish I'd thought of this sooner. Short of removing the engine and having the block flushed and cleaned I don't know what else would have fixed this problem.

Someone else said to replace the fuel pump to fix this problem. I tried that. It did not work. It still spat oil out the vent tube to the tune of about one quart every 150 miles.

I also replaced all the engine seals and gaskets. Front and rear main seals too which were also leaking. So now my oil leaks are a thing of the past. Good luck!

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