base pressure fluctuation
base pressure fluctuation i have a twin walbro, -8 feed to aeromotive rails, aeromotvie pro series regulator and stock feed as return. my question is, my pressure is set at 60psi idle. it will sometimes go to 55 or 65 psi when i turn it on. it seems to start and go to 60psi or start and be +/-10psi. what would cause this? bad regulator
Launching!
Joined: Jan 2009
Posts: 241
Likes: 0
From: Mead, WA
...Or varying voltage at the pumps. Most likely regulator, though....
Or your pumps are bad and you don't actually have the regulator set at 60, but 65. You might try setting the regulator at 50 and then see if it varies or stays at 50.
..actually thinking out loud again, stock return is what, 5/16"? If you are running two pumps, you might be over powering the return line...
Or your pumps are bad and you don't actually have the regulator set at 60, but 65. You might try setting the regulator at 50 and then see if it varies or stays at 50.
..actually thinking out loud again, stock return is what, 5/16"? If you are running two pumps, you might be over powering the return line...
Launching!
Joined: Jan 2009
Posts: 241
Likes: 0
From: Mead, WA
.5 v loss at the pump is a big deal. Crimp connectors or small wiring can cause a lot of voltage loss at 30 amps.
The Aero series reg is not designed to be used with a 5/16" return line.
http://www.aeromotiveinc.com/d_syste...temdisplay=efi
You don't say if the second pump is on a relay, or they are both running all the time. [Could over run the return]
If you can't adjust the reg to at least 5psi lower than desired setting, you may have a return line problem, such as:
Kinked.
Insufficient size.
Incorrect entry into the tank.
http://www.aeromotiveinc.com/d_syste...temdisplay=efi
You don't say if the second pump is on a relay, or they are both running all the time. [Could over run the return]
If you can't adjust the reg to at least 5psi lower than desired setting, you may have a return line problem, such as:
Kinked.
Insufficient size.
Incorrect entry into the tank.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo OK. With the reg adjustment being capable of going down to 40, I'd say that's not the problem.
Have you verified that the gauge is OK?
If it's one of the little, "silver dollar" sized rail gauges, it could be the problem. I've checked many of them against the gauge on my inj bench.. Some are not within 5psi of correct, and do not repeat well, either.
Wayne may well be on the right track w/ wiring issues. Have you checked the exact voltage at each pump? How are the pump grounds done?
What's the part # on the pumps?
Does the -8 feed the rails first, then out of the rails to the regulator?
Have you verified that the gauge is OK?
If it's one of the little, "silver dollar" sized rail gauges, it could be the problem. I've checked many of them against the gauge on my inj bench.. Some are not within 5psi of correct, and do not repeat well, either.
Wayne may well be on the right track w/ wiring issues. Have you checked the exact voltage at each pump? How are the pump grounds done?
What's the part # on the pumps?
Does the -8 feed the rails first, then out of the rails to the regulator?
OK. With the reg adjustment being capable of going down to 40, I'd say that's not the problem.
Have you verified that the gauge is OK?
If it's one of the little, "silver dollar" sized rail gauges, it could be the problem. I've checked many of them against the gauge on my inj bench.. Some are not within 5psi of correct, and do not repeat well, either.
Wayne may well be on the right track w/ wiring issues. Have you checked the exact voltage at each pump? How are the pump grounds done?
What's the part # on the pumps?
Does the -8 feed the rails first, then out of the rails to the regulator?
Have you verified that the gauge is OK?
If it's one of the little, "silver dollar" sized rail gauges, it could be the problem. I've checked many of them against the gauge on my inj bench.. Some are not within 5psi of correct, and do not repeat well, either.
Wayne may well be on the right track w/ wiring issues. Have you checked the exact voltage at each pump? How are the pump grounds done?
What's the part # on the pumps?
Does the -8 feed the rails first, then out of the rails to the regulator?
Launching!
Joined: Jan 2009
Posts: 241
Likes: 0
From: Mead, WA
OK. With the reg adjustment being capable of going down to 40, I'd say that's not the problem.
Have you verified that the gauge is OK?
If it's one of the little, "silver dollar" sized rail gauges, it could be the problem. I've checked many of them against the gauge on my inj bench.. Some are not within 5psi of correct, and do not repeat well, either.
Wayne may well be on the right track w/ wiring issues. Have you checked the exact voltage at each pump? How are the pump grounds done?
What's the part # on the pumps?
Does the -8 feed the rails first, then out of the rails to the regulator?
Have you verified that the gauge is OK?
If it's one of the little, "silver dollar" sized rail gauges, it could be the problem. I've checked many of them against the gauge on my inj bench.. Some are not within 5psi of correct, and do not repeat well, either.
Wayne may well be on the right track w/ wiring issues. Have you checked the exact voltage at each pump? How are the pump grounds done?
What's the part # on the pumps?
Does the -8 feed the rails first, then out of the rails to the regulator?
I'm leaning towards either wiring or return is too small. 5/16 is awful small for two larger pumps.
Try killing one pump, set the regulator at 58 or whatever, then see what it does. If that works, then rewire the pumps and run a second relay with a switch in the cab where you can turn it on when you need it. I'd say upgrade the return, but you don't really need two pumps running all the time anyway.
Launching!
Joined: Jan 2009
Posts: 241
Likes: 0
From: Mead, WA
I'd try just shutting one off for now. If the wiring is fresh, chances are pretty good you don't have much of a voltage loss going on. Besides, if it's over powering the return, fixing the wiring will only make it worse. Killing a pump is fairly quick and easy and you'll see immediate results.