Join Date: Jan 2001
Location: Lehigh Valley, PA
Problem with Edelbrock performer carb going dry after a few days
I have a problem with my Edelbrock 600 cfm carb, with an electric choke.
If I run the car every few days all is fine but if it sits for about three days or more, it’s just like trying to start my engine that had run completely out of gas.
I thought that it must have been a float bowl issue and the carburetor was simply allowing gasoline to siphon back down into the line. Based on this assumption, I rebuilt the carb. However, the same problem occurs after sitting for a few days.
It has a Holley mechanical fuel pump, which pumps fine once the 302 engine is running. It seems that the fuel either evaporates or it physically looses fuel; back down the line, towards the mechanical fuel pump.
If I start it up every day or so there is no problem…just if it sits a few days. Then I have to crank the starter over “excessively” just to get the fuel pump to get the gas back where it is supposed to be. Once it fires up then I’m fine again. The cranking is good in the sense it gets oil pumped up into the top of the engine before it fires.... but its annoying spending sometimes close to 5 minutes trying to get the engine to fire for the first time. The ignition itself is all fine…all aftermarket MSD.
Am I missing something here? I have an inline fuel pressure gauge between the pump and carb, which holds good fuel pressure at an idle.
I even pondered over the idea of installing a one-way “check valve” but know this would nbe more of a band-aid and not the fix for the problem with my fuel system.
I wonder if there is a check valve in the fuel pump itself, which was faulty from day one…would that allow my fuel already in the carb to drain back?
I recall even rebuilding the fuel pump a few years ago. I don't recall a pump check valve being one of the parts in the repair kit....just gaskets and diaphragm parts.
(Just a side note: When I modified my engine, I disconnected and capped off the OEM fuel return line and left it in place. I no longer have the emissions charcoal can, etc, on the car. I didn’t see any need for a fuel return line…as I seem to recall it is more of a vapor return thing used with the OEM carb).
80 T-Bird 302, ported/polished heads & RPM Airgap, MSD ignition, C-4 Trans w/shift kit & B&M Megashifter, 5-lug 3.73-8.8 Trac-Lok, Dual 2.5 exhaust w/ equal length long tube headers