Fuel Pressure Question
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Junior User
Joined: Jan 2015
Posts: 68
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From: Huntington Beach, CA
Fuel Pressure Question
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
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
Thread Starter
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Junior User
Joined: Jan 2015
Posts: 68
Likes: 0
From: Huntington Beach, CA
Lead Gopher
Joined: Aug 2012
Posts: 10,051
Likes: 1,607
From: Seattle
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.
.
.
Lead Gopher
Joined: Aug 2012
Posts: 10,051
Likes: 1,607
From: Seattle
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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Can Your Fuel Pump Provide Too Much Pressure?
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Fleet Mechanic
Joined: Jan 2014
Posts: 1,946
Likes: 118
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.
Thread Starter
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Junior User
Joined: Jan 2015
Posts: 68
Likes: 0
From: Huntington Beach, CA
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.
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Thread Starter
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Junior User
Joined: Jan 2015
Posts: 68
Likes: 0
From: Huntington Beach, CA
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.
Thanks!
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