I recently swapped in a freshly rebuilt engine. I am still having the problems I had with the previous engine. I am still getting gas showing up in the oil. I have gone through three fuel pumps thinking maybe that was the problem, but no dice.
When I bought the Jeep, the person before had torn out most of the extra emissions vacuum lines. He basically left the ignition advance and all the vacuum lines going directly to the carb. He took off the stock air filter and replaced it with an aftermarket set up. Even without all this stuff it ran great for about a year.
I started running into problems with it dying under load at low rpms when starting from cold or medium engine warmth. In Nuetral or park it runs pretty well, but put it in drive and let you foot off the brake and it dies. I had heard of the Carter giving these symptoms, so I replaced it with a Weber. It ran better, but still most of the same problems persisted.
Someone I thought knew what he was talking about said I may be getting excessive blow-by in the cylinders and it may be time for a rebuild. Ok, bought a fairly identical engine and took it to a very good machine shop an had it machined and remanufactuered.
After a month of figuring out some small gremlins I got it back from my mechanic. Now I am at about 500 miles and I notice I am getting gas in my oil again and it still has not been working well at idle.
Finally I replaced all of the remaining vacuum lines thinking maybe I have a leak somewhere. Nope.
The only thing I have not replaced in the fuel system that could have some type of effect is the vapor cannister.
I am stumped. I am thinking these gas in the oil and the dying when I start are somehow connected. Has anyone else had this problem and how did you fix it?