Decided I need a fuel pressure gauge and regulator. The fuel pressure measured 7.5 PSI a year or so ago. Didn't think that was far enough out of spec to cause a problem but now I'm wondering. Occasionally the car doesn't idle well, as if it were loading up. Happened yesterday and it even stalled a couple of times. Checked the sight glasses for the float levels on the Summit Street and Strip carb when I got home and the primary was right in the middle but the secondary was up to or over the top. I'm wondering if the slightly high pressure is overpowering the needle valves occasionally. Anyone want to suggest a set of parts to add a gauge and regulator to the line from the stock mechanical fuel pump to the Summit Street & Strip carp? Anyone have a picture of a similar setup?
Holley makes a pretty simple regulator. it has dual outlets but you can plug one or get an adapter and put the gauge on the other side. The more expensive regulators have a 1/8"npt port just for putting the gauge on, or a line to a gauge inside the car. I have an Aeromotive regulator, dual feed cause one is for nitrous, but that side can be plugged. the small hose coming outthe middle is for my gauge, it goes to the isolator first so you dont run fuel into the car. but you can just put a small mechanical gauge right into the regulator if you dont need to monitor it while driving. And I think that 7.5 psi is too high. I have mine set at 6.
Here is he basic Holley regulator that would work fine. http://www.jegs.com/i/Holley/510/12-804/10002/-1?CT=999 Just get the plug that goes from the outlet size and reduces to 1/8"npt and get a small gauge. http://www.jegs.com/i/Mr.+Gasket/720/1563/10002/-1
7.5 is fine for a holley carb. You needle might have some crap stuck to it. that would make it over fill the float bowl. Had this happen before. Clean it and reset. Might fix your problem.
The regulator and gauge look like they would do the job. I don't need the gauge inside the car so mounting it on the regulator should be good. I didn't know the regulator would have a second outlet. That simplifies things. THANKS for your help. :Handshake
I'm going from memory, but seems like 4-7 PSI was a good range. Its a new Summit Street & Strip carb. Couldn't make my Holley carb run well on light throttle so I bought the Summit.
A Holley could run on 7 or 7.5 but its the high point of the range. Bringing it down to six couldnt be a bad idea. Would be a little more dependable since you are already having issues. It wouldnt hurt to check your needle and seat though just in case. Most good regulators are dual outlet. the only single outlets ive seen are the little round inline ones at the parts stores with the round dial and numbers on it.
The guy i sold my old mustang to had an idling problem, Holley 700 dbl. pumper...Decided not to mess with it and bought a brand new one....Didn't cure anything....Turned out to be a chipped tooth on the distributor gear.....Guess who was given the original race flowed carb?
Got the Holley regulator and also a Holley gauge. Can't remember now what came with what but they had all the fittings I needed except two 3/8 NPT-to-5/16 barbed hose fittings. Got them installed. Factory set the regulator for just under 6 PSI and I left it there. Checked the sight glass and the secondary is just over half. Engine idles fine. Have some plastic washer/gaskets to install in the needle valves (paper ones tore up). Will reset the floats then. Thanks for the recommendations.
Alchol in gas is playing some havoc also on the needle and seats. It looks like you got problem fixed, if you do buy needle valve, get the all steel! Good luck
