Quantum Fuel 255lph pump problems
Cargo Master
Joined: Nov 2009
Posts: 2,190
Likes: 620
Run heavier gauge wiring and go battery direct. That's the only thing you can do. I don't recall what gauge the factory wiring is, that runs to the fuel pumps, but I want to say it's a 14 or 16 AWG. Which should be able to handle the Amp loads you're looking for (22 and 32 amp ratings, respectively) Putting a seperate Full battery voltage relay for each fuel pump is probably your best bet, to get the maximum amperage you can to the pump.
Last edited by SFaulken; Jul 25, 2021 at 04:11 PM. Reason: Added clarification
Elder User
Joined: Dec 2016
Posts: 854
Likes: 39
From: Mid Missouri
Glad to hear you've found the issue. Thats correct, they do not say to upgrade the wiring and when I called them about it they assured me upgrading the wire size was not needed; the stock wire is sufficient. Please let us know what you come up with.
Have you seen this thread, it may help you decide about the wiring:
https://www.ford-trucks.com/forums/1...l-pumps-2.html
Have you seen this thread, it may help you decide about the wiring:
https://www.ford-trucks.com/forums/1...l-pumps-2.html
Thread Starter
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Junior User
Joined: Jan 2016
Posts: 91
Likes: 6
Run heavier gauge wiring and go battery direct. That's the only thing you can do. I don't recall what gauge the factory wiring is, that runs to the fuel pumps, but I want to say it's a 14 or 16 AWG. Which should be able to handle the Amp loads you're looking for (22 and 32 amp ratings, respectively) Putting a seperate Full battery voltage relay for each fuel pump is probably your best bet, to get the maximum amperage you can to the pump.
Thread Starter
|
Junior User
Joined: Jan 2016
Posts: 91
Likes: 6
Glad to hear you've found the issue. Thats correct, they do not say to upgrade the wiring and when I called them about it they assured me upgrading the wire size was not needed; the stock wire is sufficient. Please let us know what you come up with.
Have you seen this thread, it may help you decide about the wiring:
https://www.ford-trucks.com/forums/1...l-pumps-2.html
Have you seen this thread, it may help you decide about the wiring:
https://www.ford-trucks.com/forums/1...l-pumps-2.html
Cargo Master
Joined: Nov 2009
Posts: 2,190
Likes: 620
Thread Starter
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Junior User
Joined: Jan 2016
Posts: 91
Likes: 6
Yeah I will have to.
Thread Starter
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Junior User
Joined: Jan 2016
Posts: 91
Likes: 6
Welp ran power directly to pump, still getting only 26-29 psi. Voltage at the pump key on engine off is 11.49 to 10.48, engine running it is 12.94. 2 bad pumps, amazing. What the hell do i do now....if I get another set of pumps, it's just going to be crap too. Did anyone actually measure their pressures when they get one of these? The front ran fine. Rear lean condition for sure.
Thread Starter
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Junior User
Joined: Jan 2016
Posts: 91
Likes: 6
I have a tre perf pump, no module and tested it in a jar. Pegs over 100psi with power directly to it. Might hook that one back up, just not ideal without a module.
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Mountain Pass
Joined: Sep 2020
Posts: 249
Likes: 19
From: Mid Michigan
I feel your pain. It's BS the stuff they sell now days. I have been starting to think of a way to build a two way pressure relief / check valve to replace the FDM module. One way to open the valve and allow the return line to open when the pump is energized. The second way to keep the valve shut when running off the opposite tank. Then we could use whatever dang pump we wanted and could just scrap the FDM module all together. Build a little hanger for the pump and be done with it.
Cargo Master
Joined: Mar 2010
Posts: 3,326
Likes: 292
From: Laramie, WY
Welp ran power directly to pump, still getting only 26-29 psi. Voltage at the pump key on engine off is 11.49 to 10.48, engine running it is 12.94. 2 bad pumps, amazing. What the hell do i do now....if I get another set of pumps, it's just going to be crap too. Did anyone actually measure their pressures when they get one of these? The front ran fine. Rear lean condition for sure.
Elder User
Joined: Dec 2016
Posts: 854
Likes: 39
From: Mid Missouri
Welp ran power directly to pump, still getting only 26-29 psi. Voltage at the pump key on engine off is 11.49 to 10.48, engine running it is 12.94. 2 bad pumps, amazing. What the hell do i do now....if I get another set of pumps, it's just going to be crap too. Did anyone actually measure their pressures when they get one of these? The front ran fine. Rear lean condition for sure.
Thread Starter
|
Junior User
Joined: Jan 2016
Posts: 91
Likes: 6
I feel your pain. It's BS the stuff they sell now days. I have been starting to think of a way to build a two way pressure relief / check valve to replace the FDM module. One way to open the valve and allow the return line to open when the pump is energized. The second way to keep the valve shut when running off the opposite tank. Then we could use whatever dang pump we wanted and could just scrap the FDM module all together. Build a little hanger for the pump and be done with it.
Thread Starter
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Junior User
Joined: Jan 2016
Posts: 91
Likes: 6
I hooked it directly to the tank outlet, so bypassed everything. I even replaced the regulator for kicks.
Thread Starter
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Junior User
Joined: Jan 2016
Posts: 91
Likes: 6
Yes I was getting around 20 psi while running and couldn’t get it to go higher while accelerating. I also measured power to it at 12 volts. Quantum tech support had me ship it back to them (at my expense) to tell me they couldn’t find anything wrong with it. That is when I had them refund my money. I put the stock pump back in and has been running great since.
Elder User
Joined: Dec 2016
Posts: 854
Likes: 39
From: Mid Missouri
[QUOTE=nc73;19988410]Well I'm going to prove it to them by hooking them up directly to the gauge and take a pic. Might just go for a refund instead. No way I'm f'ing around some more. I will probably do stock rear and Tre front without FDM. Who knows maybe it' because i left part of the old pump wiring in place.[/QUOTE
Hope your luck is better than mine. I forgot to add in my last post the Quantum pump worked great for 2 or 3 days. Then the low pressure problems started...
Hope your luck is better than mine. I forgot to add in my last post the Quantum pump worked great for 2 or 3 days. Then the low pressure problems started...