[78w72]

With a Qjet that has the normal center inlet, I just put my regulator a few inches away from the carb to clear the air cleaner. Its small and light enough that it works perfect with no bracket using -8 braided line, but could be spliced into factory steel lines too. Ive read that ideally you want the regulator as close to the carb as possible.

What pump & carb do you have? The 550 pump is supposed to be ~6psi, i have the older 1100 pump thats adjustable down to 7psi and it doesnt have any flooding issues on a later cliff built 78 Q-jet.. he actually suggested removing the regulator for better flow if its not absolutely needed. I only added one becaues for race use I turn up the pump to 10+psi then keep the regulator at ~7.

[chiphead]

I'm running the RobbMC 550 with 6AN line back to fuel tank. 4150 QF 750 double pumper that I've been razor tuning for about 2 years now. It runs like fuel injection on a good day, usually defies the double pumper reputation as a slobber machine.

I'm seeing that the fuel level in the bowls will rise and fall in a way that hasn't happened with the cheap shelf pumps. I start the engine, the fuel is in the center of the bowls. After the engine reaches curb idle and warms up, the fuel level drops to the bottom of the sight glass. Both bowls do the same thing at the same time, and I've been through the bowls 3 times, so I don't think its the carb itself. With the new pump, it tends to cruise rich for no reason, then clear up for no reason on the interstate at random. I thought it was the tune until I saw the fuel level behavior.

I put a Holley 803 deadhead regulator and a gauge on it as a test. If I crank the regulator to full pressure, the fuel pressure gauge bounces between 6-7 at idle. If it back it off to 5.5, it's rock steady. So I assume the pump pulses are bumping the float needles open. The plan is to regulate it to 5 PSI and confirm the cruise mixtures don't wander off.