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-   -   Fuel pressure too high - how to fix? (http://squarebirds.org/vbulletin/showthread.php?t=22521)

Gigs 03-04-2018 07:29 PM

Fuel pressure too high - how to fix?
I bought a replacement fuel pump at AutoZone for about 30 bucks and installed it. The previous owner of my car put in a gauge for the fuel pressure, and now the pressure is too high. From what I've read, I want it between 5 and 6.5 psi. I had a problem with fuel blowing past the needles. Anyway, I'm not sure where to start in lowering the pressure. Can somebody help me out with how to do that?

jopizz 03-04-2018 07:35 PM

What make/model of fuel pump did you buy? A stock mechanical fuel pump should not be putting out more than around 6 psi.


Gigs 03-04-2018 07:54 PM

Thanks for the quick response, John. I think it was branded Duralast, AutoZone's house brand. It was the only option they had there. My old pump was definitely in the normal range on the gauge I have, but this new one has been up as high as 8 at idle.

jopizz 03-04-2018 08:11 PM

At normal idle 8 psi is too high. Most carburetors don't like anything higher than 6 psi. Your only options are to bring it back and try another one or install a pressure regulator. If your old pump was in the normal range then that's not the reason for gas blowing past the needle valves. Are your needle valves rubber or metal. Ethanol has a tendency to harm some rubber parts.


Gigs 03-04-2018 08:23 PM

Thanks. Honestly, I'm not sure if I've got rubber or metal. I haven't seen, but knowing the guy who put the car together, I'm betting on metal. He would always buy the more durable part if given the choice. Maybe I should try the regulator route. Is that a part I can easily pick up at a regular auto parts store? Anything I need to know about installing it?

jopizz 03-04-2018 08:36 PM

Most new carburetor kits come with the rubber needle valves. If I have metal ones and they are not worn I reuse them. You should be able to get the regulator at most auto parts stores. They are usually used with electric fuel pumps. Before spending money on a regulator I would inspect the needle valves and floats if you are getting too high a fuel level.


Gigs 03-04-2018 08:45 PM

Thanks. I was just looking at the selections at AutoZone, Advance, and Napa. Napa looks like they have dozens of options. I see ones ranging from about $20 up to $180. I just want to get something safe hooked up as quickly as possible. Of courses, I'm not looking to spend more than necessary. Taking the pump back is probably out of the question since it was probably late summer when I bought it and put it in. It looks like my daily driver is going to need some major work, and I'm going to need to get myself to my job.

jopizz 03-04-2018 10:57 PM

If your original pump was putting out the correct pressure then why not put that back in and fix your carburetor. It's obviously not a fuel pressure problem. If you spend money on a regulator you are still going to have the same issue.


Gigs 03-05-2018 12:28 PM

I'm sorry. I wasn't clear. I meant the old fuel pump had been putting out the right pressure before it stopped working. I did drive the car this morning, and I didn't have any problems. I stopped a few times to pop the hood, check the pressure, and make sure things looked ok. The fuel pressure was like around 6 psi, so if that continues, I think I'm ok there.

jopizz 03-05-2018 12:37 PM

I misunderstood your original post. It sounds like you are good to go. Sometimes varnish can build up around the needle valves from sitting and make them stick and not seal correctly.


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