Hey guys

So I swapped in a new fuel filter. When we changed to the new one, we decided to leave the fuel pressure regulator off. It wasn't my idea, and the other guy helping me wrench didn't think we'd need it.

He was wrong... fuel pressure was pinging at about 9psi, which is way too high for the Edelbrock carb I have on the 352.

So I reinstalled the FPR, and I've got the pressure down to about 6.5psi. That's still too high as Edelbrock says it should be no more than 5.5.

I've tried loosening the nut on top of the FPR but that seems to do literally nothing.

I've taken the top of the carb apart as well and had a peek inside. It seems clean and good to go in there.

What should I be attempting next here?

Thanks

 

Are you running an electric fuel pump there? I've never seen a mechanical pump put out over about 6 PSI.


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Mechanical (here's a few shots of the setup)

 

I'd suspect the fuel pump. Sounds like too much pressure coming from it. I run mechanical pumps on all my engines and no external aftermarket regulator on any of them and no issues here. Others may chime in with other thoughts.


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Here's some info from AirTex - they rebuild a ton of fuel pumps.


Can Your Fuel Pump Provide Too Much Pressure?


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If I'm not mistaken, the nut on your FPR is just a "lock" for the adjustment which it the center screw. The screw, with a slotted head, is awkwardly pointed towards your carburetor so you can't see it. If possible, re-orient the FPR so you can get to the adjustment screw more conveniently.

 

well I feel dumb... that would make a whole lot more sense. I'll check that out now.

 

You were right. Went out and adjusted it, and have it sitting right at 5.5psi now.

Thanks!

 

....cool....

 

Reps sent to Resonateur. Good job.


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