During a rear brake job, the rear of the car was placed on jackstands creating a large angle toward the front of the car. Approximately 2 weeks later, fuel was dripping from the vibration damper. Upon searching for the source of the fuel, it was determined it was coming from the dipstick port in the crankcase. The oil was drained, and over 10 quarts of oil and gas was recovered. We placed the front of the car on jackstands, thereby leveling the car. There has been no further fuel leaks. The question is, What allowed the fuel to get into the crankcase? What needs to be fixed to prevent this situation? The car is a '67 BB coupe tripower. Thanks for your help. Bob
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Re: Fuel in Crankcase on a C2 Tripower
First, The level of the fuel in the tank (more than likely full) needed to exceed the level of the carbs...or at least the front carb.
Second the carb float(s) needed to be open...possibly stuck or unable to close due to the angle of the car. (The car sounds like you stood it on end....)
Put some new oil in the engine...start it up... and observe the carb throats to see if excess full is running into the engine in any carb. If not, don't stand it on end again with a full tank!!!! If you observe fuel then the floats are open or at least set too high.... -
Re: Fuel in Crankcase on a C2 Tripower
Has the car been cranked since? If not, I'd want to pull the plugs and make sure there's no puddled gas to hydraulic a cyl and bend a rod. If (big if) it did in fact go past the needles in a carb there may still be some up top. I'd have thought a fuel pump diaphram would've been more likely, but then it wouldn't be intermittent.Comment
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Re: Fuel in Crankcase on a C2 Tripower
A leaking fuel pump diaphram will cause this also. I would replace the fuel pump right away.
GeorgeComment
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Re: Fuel in Crankcase on a C2 Tripower
A leaking diaphram will typically weep fuel out of the fuel pump "weep" holes.
Had that happen recently.....Comment
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Re: Fuel in Crankcase on a C2 Tripower
What happened is not uncommon. I've seen this several times and it was a bad needle and seat or stuck float. Fix the problem carb, Change the oil and filter, remove all the spark plugs and remove the pos side of the coil to prevent any spark. Then spin the engine with the starter to flush all cylinders of gas. With the plugs out, I like to squirt a little oil into each cylinder and spin the engine to lub the cylinder walls and rings that have been washed with gas. When the engine is started it will smoke until all the oil in the combustion chambers is burned off.Comment
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the carbs are bleeding down
this has been a problem since 1967 and lots of BB corvette engines were lost because of this. the end carbs use the nytrophil floats which have a shorter fulcrum arm than the brass ones and can not hold back the build up of pressure in the fuel system.since you can not use the longer armed brass floats in the end carbs i used a smaller diameter needle seat instead of the .110 which are harder to seal bcause of the area. unless you are racing the car the smaller needle seat will not cause fuel starvation. also check and see if you fuel tank is bulding pressure because of the heat from the mufflers. i just changed the fuel tank cap to a external vented type to allow this pressure to escape. you can just take a old cap and drill a 1/8' hole in it to let out the pressureComment
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