Driven Diesel regulated return fuel pressure - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 12-07-2012, 03:25 PM Thread Starter
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Driven Diesel regulated return fuel pressure

I have a Driven Diesel regulated return and recently installed dual stock fuel pumps. Before the install, I had the fuel pressure gauge mounted to the regulator under the hood, and was getting 60-65psi steadily. And I could adjust the bolt in the regulator to move the fuel pressure up or down.

Since the dual stock fuel pump install, I moved the gauge to in cab with an Autometer gauge, and the pressure has been 70+ consistently. I tried to adjust the regulator bolt, but even loosened all the way, the pressure barely budged. And just for grins, I twisted the bolt both ways, and I can definitely get the pressure to go UP, it just won't go down below about 70. I went so far as to barely have the bolt in the housing before coming out completely, and still it was above 70psi.

Any ideas?

2002 F-250 7.3, SRW, 4x4, Lariat, AFE stage 2 intake with Proguard 7, 4" MBRP turbo back exhaust 5" tip, Garrett 38r, reg return, TS 6 position chip custom tunes by Chris B. at Truck Source Diesel (TSD), 6.0 trans cooler, EBV delete, 3 pod factory match Autometer gauges with: EGT, Boost, Trans oil...future plans: BTS tranny then hybrid 238/80
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post #2 of 11 (permalink) Old 12-07-2012, 03:39 PM
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Re: Driven Diesel regulated return fuel pressure

Wow, I hadn't thought of that happening. Hopefully some other dual pump guys will chime in. I take it you don't want to run 70? I run about 65. Seems to be about right.

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post #3 of 11 (permalink) Old 12-07-2012, 03:40 PM
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Re: Driven Diesel regulated return fuel pressure

Your regulator may be too small. The gauge goes down when you shut the truck off right?

Early '99, 7.3/4R to Cummins 6.7/ZF6 CONVERSION, AIR LOCKERS, 4:11, 35", '05 HARLEY FRONT , TRAIL READY W/WARN.

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post #4 of 11 (permalink) Old 12-07-2012, 04:35 PM Thread Starter
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Re: Driven Diesel regulated return fuel pressure

I think 70 is too high and could shorten the life span of the stock pumps. Truck runs great, but I can't even see what it runs at lower pressures as it is now. At one point, it was hitting 100, which was really freaking me out. Even now, it will start at 80-90 and then trend downward as I drive it.

The gauge does NOT go down after I shut the truck off. The needle stays at the last reading. ON start up, it resets to zero and then starts marking pressure during start up. Actually, all my other autometer gauges go to zero on shut down except this one. Is that unusual?

2002 F-250 7.3, SRW, 4x4, Lariat, AFE stage 2 intake with Proguard 7, 4" MBRP turbo back exhaust 5" tip, Garrett 38r, reg return, TS 6 position chip custom tunes by Chris B. at Truck Source Diesel (TSD), 6.0 trans cooler, EBV delete, 3 pod factory match Autometer gauges with: EGT, Boost, Trans oil...future plans: BTS tranny then hybrid 238/80
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post #5 of 11 (permalink) Old 12-07-2012, 04:43 PM
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Re: Driven Diesel regulated return fuel pressure

Is the gauge mechanical or electric, sounds like electric. I would question if it is working properly. It would be fairly normal to stay at the last reading if you had a ck. valve on the outlet. With the key on eng. off and pump not running crack a fuel line to releive pressure and see if the gauge goes down, this should tell you if it's working.

Early '99, 7.3/4R to Cummins 6.7/ZF6 CONVERSION, AIR LOCKERS, 4:11, 35", '05 HARLEY FRONT , TRAIL READY W/WARN.

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post #6 of 11 (permalink) Old 12-07-2012, 05:02 PM
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Re: Driven Diesel regulated return fuel pressure

Quote:
Originally Posted by 2002f-250 View Post
I think 70 is too high and could shorten the life span of the stock pumps. Truck runs great, but I can't even see what it runs at lower pressures as it is now. At one point, it was hitting 100, which was really freaking me out. Even now, it will start at 80-90 and then trend downward as I drive it.

The gauge does NOT go down after I shut the truck off. The needle stays at the last reading. ON start up, it resets to zero and then starts marking pressure during start up. Actually, all my other autometer gauges go to zero on shut down except this one. Is that unusual?
My guage under the hood goes to 0 after shut off so you may have issues.

REBORN 20 Over on 3/2/11- Pics in gallery- 2000 F250, Auto, 38r, Full Force 238cc/100%, TE 17* hpop, DP F5,HI,60T,80E,120R,140A, Studs and 910's with DI PR's, JW VB in 2nd stock tranny, Walbro 392, Bellowed, In-Tank, Pre-Pump, boost fooler, and RR. Air Dog, SS cover, 6.0 TOC,4" straight piped and guages, 6637, coolant filter, 4" Lift on 33's.
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post #7 of 11 (permalink) Old 12-07-2012, 08:17 PM
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Re: Driven Diesel regulated return fuel pressure

he's not relying on his gauge under the hood, he said he moved it inside his cab which means its prob electric. All my autometers are C2's which are fully electric and stay on the current reading when shut down. The when i turn it back on it resets to zero then goes to whatever the current reading is

2000 F250 ccsb 4x4. 218,000 miles, 38r 1.0 housing with turbo master, 238/80% FFD hybrids, BTS
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post #8 of 11 (permalink) Old 12-07-2012, 09:16 PM
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Re: Driven Diesel regulated return fuel pressure

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Originally Posted by lariat7.3 View Post
he's not relying on his gauge under the hood, he said he moved it inside his cab which means its prob electric. All my autometers are C2's which are fully electric and stay on the current reading when shut down. The when i turn it back on it resets to zero then goes to whatever the current reading is
That's why I said with the key on, eng. off bleed fuel and see if the gauge goes down. Should slowly go down, this will show if it's working below 70. If it does he can rule it out.

Early '99, 7.3/4R to Cummins 6.7/ZF6 CONVERSION, AIR LOCKERS, 4:11, 35", '05 HARLEY FRONT , TRAIL READY W/WARN.

6.7/ZF6 SWAP. IT'S ALIVE 11-13-12
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post #9 of 11 (permalink) Old 12-07-2012, 10:58 PM
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Re: Driven Diesel regulated return fuel pressure

yeah ^

2000 F250 ccsb 4x4. 218,000 miles, 38r 1.0 housing with turbo master, 238/80% FFD hybrids, BTS
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post #10 of 11 (permalink) Old 12-07-2012, 11:38 PM
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Re: Driven Diesel regulated return fuel pressure

anything happen if you pull the fuse to one of the pumps?
Have you called denis to see if he has any ideas?

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