How can gas get into the engine oil of a 1975 volkswagon beetle?
Asked by williso Mar 19, 2013 at 05:02 PM about the Volkswagen Beetle
Question type: Maintenance & Repair
asked the question befor on this site about the engine oil going up on the dip stick---yes the oil is thin and it smells
with gas--so now I changed the question---the car starts and runs good but some gas fumes in the inside of car---
who can help---thanks--
6 Answers
thanks Mark---was wondering if it was the fuel pump or the carb or maybe the piston rings---
If the fuel mixture is rich, gas could get past the piston rings into the engine oil while running. A rich condition can be confirmed by the color of the spark plugs and the smell of the exhaust.
wow I have been working on bugs forever I never had this problem .GAS THE CRANKCASE ! I I replaced the fuel pump .the most likely culprit .NOPE I took off the carb ,and somehow i had lost a bolt ,and gasket was half gone . This loss of seal allowed gas to migrate through the manifold into the crankcase .I ended up with about a quart 1/2 extra when I drained the oil -EXTRA GAS . I will update with new oil ,and a tight carb gasket .Have been too busy to test it . I literally ran out of gas today ! tomorrow we will see Jake
I had this exact same problem, the carb was leaking gas Which eventually found its way down to the crankcase. Something to do with the needle not seating correctly. Pulled the dipstick and it’s seemed like there was too much oil in it plus a smell of gas after parking the car. I would say look at your carb and if you do find it leaks change the oil after you fix it
BryanBelman answered 2 years ago
Same issue with a 74 super beetle motor I am helping a guy with. Gas in the chank case. I took the top of the carb (30/31 PICT-3) and filled the bowl to be sure the float was floating properly and it was. We were talking and after 5 minutes we looked at the carb float bowl again and it was an inch lower in gas, where did it go???? He does not have history of the car, new purchase to him so I said get a new EMPI 34 PICT-3 carb and be done with this old one.
Pull the carb off and look for small hairline fracture where the main jet goes or into the Venturi from the bowl side, if any are found then replace the carb, if none are found then set the carb level and add fuel to the bowl and look for seepage anywhere, if it comes out of the Venturi then there is a crack too small to see and the carb should be replaced.
