Corvette_fetish

Just recently my Vette has been exhibiting brief hesitations during accelerations from complete stops, plus I've definitely noticed that every time I go over a speed bump (very slowly of course) after the front wheels come down the engine almost stalls no matter how gentle you take the bump. This can even happen while going over train tracks. hitting little road bumps, etc. The engine has never actually "quit", but sometime it comes real close. I have a Summit fuel pressure gauge in the engine compartment. Lately it sometimes has been as high as 7, or can drop as low as 1, and you can see the fluctuations as the engine idles. I have an electric fuel pump that was installed by the previous owner, but I don't know the manufacturer. I'm assuming that it's the fuel pump that's causing the anomalies, but again, I'm no mechanic, so could there be any other likely cause for this? Anything else I should consider before just replacing the pump? Thanks! Oh yea, the fuel filter was cleaned recently.

78 Vette

Your fuel pressure should be 5 to 7 psi and steady. if not it can be faulty regulator or pump. As far as the stalling over bumps goes it souds like the fuel level is to high in the carb . what typ of carb,fuel pump,and regulator are you using?

Corvette_fetish

It use to keep a constant steady 7 psi. This behavior just started a few weeks ago. I have a Holley 750 carb. I don't know what brand the fuel pump and regulator are. I will have to look.

MotorHead

I just fixed a similar problem with mine, the secondary floats were too high, also I don't trust those fuel pressure gauges mine starts at 6psi and drops to 0psi when warmed up. Check the floats, adjust front so gas is lapping at the sight hole and do the same with the back then turn the back down one full turn. :D

Corvette_fetish

Well, I guess I should have had this fuel "issue" addressed before the Poker Run, lol!