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I have a fuel return line in my 72 RR that I don't use. I've never used it. It runs up along inner passenger fender in engine bay near firewall. Charcoal canister is long gone. I've just left it open (uncapped) and unused for years. Should I use it? Is it needed? If so, how do I hook it up? (As...

Is the float spring supposed to apply pressure to the float up or down? I have a Holley 4150 DP with center hung float. I thought spring was supposed to apply some pressure up, to keep needle closed during bumps or turns, etc. Mine gives barely any tension but if anything it's definitely down...

I'm having some carb issues on my 340 with an AED Holley 750 DP. Not sure if I found a problem. Is the arm on the primary accelerator pump supposed to sit directly on the cam? I have a gap and the cam doesn't actuate the pump until nearly full throttle. Secondary arm sits right on cam and...

If you are changing out your fuel tank, don't order this fuel neck grommet --- OER MF-296 --- from Summit. It doesn't fit. I spent 2 hours, boiled it, used Dawn liquid, WD-40, dialectric grease. Pushed my fuel neck with all my might. The grommet is too small. In the Summit reviews about one in...

I'm putting a new fuel tank in my 72 RR. I am using my original sending unit, which I recently replaced the brass float and sock. It reads my fuel level perfectly and works really well. But while I have it out, I'd like to clean the already clean sock as much as possible. Just spray with carb...

If I hook up a vacuum gauge to inlet port of Edelbrock fuel pump, what amount do I need to see on gauge when I crank motor to know the pump (which is brand new) and more importantly, the cam eccentric is good? About 12? Thanks

I have a fuel vent line in my engine bay in 1972 RR. The charcoal canister is long gone, and I don't need one. Is it OK to leave this steel line open? I know I don't want to cap it. But I believe I've seen people recommend running a hose from vent line to breather or air cleaner. I'm not having...

My gas gauge isn't working. The gauge itself works (I did the ground-the-sending unit test and it pegged to full) and the unit is definitely grounded. I tested ohms and got between 140-80. It has at least 3 gallons of gas in it, but it's reading empty. So, I'm fairly certain it's sending unit...