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Old 05-26-2008, 07:43 PM
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fuel runs back to tank?

we have a 57 buick nailhead with the original 4 brl. carter afb.
have installed a new fuel pump and filter in the glass globe behind the thermostat housing.
after setting an hour or so the fuel emptys from the filter and the carb?
no leaks anywear...car runs fine once the gas gets to it.
where do I start...carb rebuild?

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Old 05-26-2008, 07:49 PM
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Sounds like you need a fuel filter with a check valve in it, like many Quadrajets have........
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Old 05-26-2008, 08:00 PM
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There has to be a breach in a fuel supply hose. Possibly on top of the fuel tank. Watch the filter after you turn it off for bubbles, if they float up through the filter it has a leak in the supply line. Since the supply line to the fuel pump is under suction, it may not appear to leak fuel.
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Old 05-26-2008, 08:01 PM
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could it go inline between the glass filter and the carb? thanks this old stuff is a little odd
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Old 05-26-2008, 08:06 PM
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sounds like that could be it. it also has a metal can type filter right off the gas tank...alot of rubber hoses to check and one of them could be leaking air...they are all dry on the outside...no drips.
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Old 05-26-2008, 08:07 PM
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Yes it could be in line after the filter, or pump, but you would see fuel leaking since this is the pressure side.
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