Fuel Pressure / Fuel Pump - Ford Powerstroke Diesel Forum
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post #1 of 55 Old 10-07-2013, 08:15 AM Thread Starter
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Fuel Pressure / Fuel Pump

My fuel pressure is jumping between 20 and 40 psi at the schrader valve. I cleaned the regulator screen,

Is this most likely a bad fuel pump? Is the pump sitting in the valley the only fuel pump this truck has or are there transfer pumps from the two tanks?
Its a 1997 F250 SCLB 2WD

Thanks!

v=n8kfkjWktmc

2006 F250 SRW CCSB 4X4
1997 F250 SRW SCLB
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post #2 of 55 Old 10-07-2013, 08:37 AM
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It is the only pump. Technically it is two pumps in a single body as it is the transfer pump/ lift pump (low pressure, high volume) from the tanks to the bowl and then back from the bowl to the heads (high pressure pump). You can try the "BB Mod" or Cali FPR spring before replacing the pump to see if the pressure comes back.

Does the pressure raise if someone holds the motor at a higher RPM? Does the engine oil smell like fuel?

Matt
'97
-Bean's: 160/100 (FF Injectors), 2/ 6-POS chips (TW & Beans tunes), Overboost controller, E-Fuel
-BANKs: downpipe, full exhaust, gauges, intercooler
-Irate: T-4 kit, IC pipes, 3" Irate Plenums, BASB Turbo
-Stage II trans.
-Mag-Hytec trans. and pumpkin covers
-6637, CCV, IDM, 6.0 Fan, 49-Federal PCM swap, MAP line Mod
-370 Amp alt., 40k trans cooler, ADRENALINE PUMP
-twin on-board air w/ 10 gal. tank

-Oh, and a 2015 F350 6.7L DRW 4x4

Re-pinning '97 Cali PCM to Federal
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post #3 of 55 Old 10-07-2013, 08:43 AM Thread Starter
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Quote:
Originally Posted by BigFuel View Post
It is the only pump.

Does the pressure raise if someone holds the motor at a higher RPM? Does the engine oil smell like fuel?
It stays just about the same throughout ranges of RPMs...I will research and try the bb mod...

Thanks!

2006 F250 SRW CCSB 4X4
1997 F250 SRW SCLB
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post #4 of 55 Old 10-07-2013, 09:00 AM
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OBS FPR Shim and Gauge Install

Matt
'97
-Bean's: 160/100 (FF Injectors), 2/ 6-POS chips (TW & Beans tunes), Overboost controller, E-Fuel
-BANKs: downpipe, full exhaust, gauges, intercooler
-Irate: T-4 kit, IC pipes, 3" Irate Plenums, BASB Turbo
-Stage II trans.
-Mag-Hytec trans. and pumpkin covers
-6637, CCV, IDM, 6.0 Fan, 49-Federal PCM swap, MAP line Mod
-370 Amp alt., 40k trans cooler, ADRENALINE PUMP
-twin on-board air w/ 10 gal. tank

-Oh, and a 2015 F350 6.7L DRW 4x4

Re-pinning '97 Cali PCM to Federal
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post #5 of 55 Old 10-07-2013, 02:20 PM
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Does the bb mod put more stress on the mechanical fuel pump?
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post #6 of 55 Old 10-07-2013, 02:44 PM
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Not really, it puts the stress on the fuel bowl. The bowl will easily handle 80 psi of backpressure but the entire system should not need to be set above 70. If the BB Mod helps it more shows that your FPR spring is worn out. You can keep the BB in there or replace the spring with either a Federal spring or a Cali spring. Just try not to have more than 70 psi.

Matt
'97
-Bean's: 160/100 (FF Injectors), 2/ 6-POS chips (TW & Beans tunes), Overboost controller, E-Fuel
-BANKs: downpipe, full exhaust, gauges, intercooler
-Irate: T-4 kit, IC pipes, 3" Irate Plenums, BASB Turbo
-Stage II trans.
-Mag-Hytec trans. and pumpkin covers
-6637, CCV, IDM, 6.0 Fan, 49-Federal PCM swap, MAP line Mod
-370 Amp alt., 40k trans cooler, ADRENALINE PUMP
-twin on-board air w/ 10 gal. tank

-Oh, and a 2015 F350 6.7L DRW 4x4

Re-pinning '97 Cali PCM to Federal
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post #7 of 55 Old 10-07-2013, 02:50 PM
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Thanks. no need to stress the bowl or hoses more. I have enough leaks I am chasing.
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post #8 of 55 Old 10-07-2013, 02:56 PM
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Eh, hoses should be rated at 150psi. It's the o-ring at the top of the filter cap that can blow out. Seen it on my cousins SD. Single shot injector trucks spec at 50+ psi at full throttle 20 seconds after hitting that mark to operate correctly. Cali's need 60+psi. This is why there are two springs. For some the Cali spring is too much pressure and they take it back out. I more suggested the BB Mod to diagnose the issue without spending any money.

Matt
'97
-Bean's: 160/100 (FF Injectors), 2/ 6-POS chips (TW & Beans tunes), Overboost controller, E-Fuel
-BANKs: downpipe, full exhaust, gauges, intercooler
-Irate: T-4 kit, IC pipes, 3" Irate Plenums, BASB Turbo
-Stage II trans.
-Mag-Hytec trans. and pumpkin covers
-6637, CCV, IDM, 6.0 Fan, 49-Federal PCM swap, MAP line Mod
-370 Amp alt., 40k trans cooler, ADRENALINE PUMP
-twin on-board air w/ 10 gal. tank

-Oh, and a 2015 F350 6.7L DRW 4x4

Re-pinning '97 Cali PCM to Federal
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post #9 of 55 Old 10-07-2013, 03:01 PM Thread Starter
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Quote:
Originally Posted by BigFuel View Post
Eh, hoses should be rated at 150psi. It's the o-ring at the top of the filter cap that can blow out. Seen it on my cousins SD. Single shot injector trucks spec at 50+ psi at full throttle 20 seconds after hitting that mark to operate correctly. Cali's need 60+psi. This is why there are two springs. For some the Cali spring is too much pressure and they take it back out. I more suggested the BB Mod to diagnose the issue without spending any money.

Perfect...I'm going to go get a BB and try that. The truck runs horribly and I think Its definitely a fuel pressure issue. we'll see though.

I'll update as soon as i do the mod..hopefully tomorrow. Where does one acquire a single BB? lol either that or i'll buy a set of BBs and give them away to all members of the forum hahaha!

2006 F250 SRW CCSB 4X4
1997 F250 SRW SCLB
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post #10 of 55 Old 10-07-2013, 03:06 PM
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I just changed the hoses with FI hose, but I dont like the way the clamps are squeezing the hose, I am going to get some Russell black nylon braid hose and redo them. For piece of mind.
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