[57halfton]

I have 2 cars in my garage that don't get driven all the time, both with Holley double pumper carbs. After sitting awhile (a month or more) the gas leaks out of the float bowls into the engine and down to the oil pan. Anyone know if this leak can be stopped ? What is leaking inside these Holleys ? Do they need to be rebuilt ?
I do change oil often.

[rsfyj]

My car did the same after a month or so I never bothered the change the gaskets. If I ran it every week it was ok

[lg1969]

Check to see if the accelerator pump housing and diaphragm is seating properly. The four screw holding the bowls are tight. Sometime the metering block or the bowl may be warped. The throttle plate could be warped, too.

[painted jester]

Originally Posted by 57halfton

I have 2 cars in my garage that don't get driven all the time, both with Holley double pumper carbs. After sitting awhile (a month or more) the gas leaks out of the float bowls into the engine and down to the oil pan. Anyone know if this leak can be stopped ? What is leaking inside these Holleys ? Do they need to be rebuilt ?
I do change oil often.

Halfton: Into the engine or onto the engine?

Jester

[57halfton]

Into the engine , no sign of leakage on the outside .

[Shaker455]

Are these older Holleys?

If there old & it's leaking down into the intake & engine then the gasket surfaces are warped from age and heat cycling.

They would need to be machined flat and if you don't have Powervalve protection then it should be added at the time of a rebuild.

We do that here on a regular basis.

[T-bucket23]

Originally Posted by 57halfton

I have 2 cars in my garage that don't get driven all the time, both with Holley double pumper carbs. After sitting awhile (a month or more) the gas leaks out of the float bowls into the engine and down to the oil pan. Anyone know if this leak can be stopped ? What is leaking inside these Holleys ? Do they need to be rebuilt ?
I do change oil often.

This is not a common problem with Holley's, are you sure it is leaking down and not just evaporating out of the bowl vent.

[painted jester]

I see your in California , check your vents Ive seen mud dobbers and other little critters build nests in vents, some times temperature cycles can create pressure that can override your needle & seats, How much gas is getting in the oil ? Conventional fuel pumps are usually the cause for gas in the oil!!! Not Holleys !! If it was a bowl leaking by the meter block and down the throat of the carb they only hold a few ounces in each bowl and being parked and not run, once the gas leaked to the level of the leak they wouldn't leak any more! But I have seen A car stored with a full tank of gas fill a crank case with gas through the fuel pump More then once!!! Especially these Chinese made K R A P !!!

Jester

[57halfton]

One Holley is an old one 25 years or so the other is 10 years old. Primary float bowls empty out into the engine then when I start them I have to crank the engine over for the fuel pump to fill the bowls so they will start.

[painted jester]

Your primary bowl might be empty but if its stored for any length of time the gas might just be evaporating Because of the bowl vents !!! If you leave a glass of water out in your garage for a length of time it will dry up And gas evaporates even faster !!!! Your carbs are probably not leaking!!! Its normal for gas to evaporate out of bowls. Most people who dont start carberate'ed cars during storage Know this! I Have to hook up batteries every spring and prime carburetors so they will start without cranking them forever to fill the carbs bowls ( the biggest cause of tar in carbereter bowls is evaporation of gas)!!! You said after they set a month or more I can guarantee you the gas evaporated from your holleys.

Jester