Fuel Pressure Problem - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

 
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post #1 of 7 (permalink) Old 08-24-2019, 06:00 PM Thread Starter
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Fuel Pressure Problem

1999 E350 7.3 diesel, 147k miles, always garaged, hooked to double battery tender, and well maintained. A couple of years ago, I modded the fuel tank, installed an Air Dog, and upgraded the fuel pressure regulator in the Fuel Bowl. Fuel pressure was 67, dropped to 60 when pulling out or romping on it, but would quickly return to 67. Since May, I've had to be away and have returned home 3 times in the last 4 months; the van has been started 3 times. Last month, it was hard to start, slow long cranks and the fuel pressure was 58, which zeroed when pulling out or romping. Pressure is slow to recover, sometimes only to about 50. Called Air Dog Tech, and he recommended changing the fuel filters. I did that this time, but no improvement. Am I looking at an HPOP problem? What can anyone recommend for troubleshooting?

2012 F-350 SD Crew Cab, SRW, LWB, 4 X 4, FX4 Offroad, Bilsteins and Bilstein Steering Stableizer, AirLift Air Bags with onboard compressor, BedLocker electric bed cover, Hellwig 1 1/4 inch rear anti-sway bar, 2017 G37 Turbo, ATS Stage I towing transmission kit, White Platinum w/Adobe, Navigation, Moon Roof, 5th Wheel Prep, Step Tail Gate, front 2 inch receiver, completely insulated, Pioneer speakers, King Ranch Package

'99 E-350 HiTop Companion Van Conversion, 7.3 SD Diesel, 5-tune DP Tuner, Triple AutoMeter C2 A-pillar gauge pod, dash mount AutoMeter C2 fuel pressure gauge, twin K&N's, 203* mod, Deraler tubed trannie pan, B&M trannie cooler, AirLift air bags, Bilsteins, 4" DiamondEye turbo back exhaust, Air Dog fuel filtration system, Hutch mod, header wrapped and high temperature painted Bellowed Up-Pipes.
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post #2 of 7 (permalink) Old 08-24-2019, 07:08 PM
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I donít see how it could be an HPOP problem. Could be the pump, regulator, sucking air, restriction in the pre-pump line or a bad sender. My oil pressure sender went out like this. I had already ordered new bearings before I swapped the sender. Pressure is back to where it was new...


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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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post #3 of 7 (permalink) Old 08-24-2019, 07:32 PM Thread Starter
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Thanks RT. Where is the sender located?

2012 F-350 SD Crew Cab, SRW, LWB, 4 X 4, FX4 Offroad, Bilsteins and Bilstein Steering Stableizer, AirLift Air Bags with onboard compressor, BedLocker electric bed cover, Hellwig 1 1/4 inch rear anti-sway bar, 2017 G37 Turbo, ATS Stage I towing transmission kit, White Platinum w/Adobe, Navigation, Moon Roof, 5th Wheel Prep, Step Tail Gate, front 2 inch receiver, completely insulated, Pioneer speakers, King Ranch Package

'99 E-350 HiTop Companion Van Conversion, 7.3 SD Diesel, 5-tune DP Tuner, Triple AutoMeter C2 A-pillar gauge pod, dash mount AutoMeter C2 fuel pressure gauge, twin K&N's, 203* mod, Deraler tubed trannie pan, B&M trannie cooler, AirLift air bags, Bilsteins, 4" DiamondEye turbo back exhaust, Air Dog fuel filtration system, Hutch mod, header wrapped and high temperature painted Bellowed Up-Pipes.
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post #4 of 7 (permalink) Old 08-25-2019, 06:16 AM
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Since the truck didnít come with fuel pressure, it would have to be wherever you put it. Mine is screwed into the back of my fuel bowl. Some people use an isolation hose from the fuel bowl to a sending unit. Fass might have a mount on their filter housing..


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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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post #5 of 7 (permalink) Old 08-25-2019, 07:37 AM Thread Starter
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Yes, I installed the fuel pressure regulator in the fuel bowl housing. You mentioned an oil pressure sending unit causing your problems. I was referring to that.

2012 F-350 SD Crew Cab, SRW, LWB, 4 X 4, FX4 Offroad, Bilsteins and Bilstein Steering Stableizer, AirLift Air Bags with onboard compressor, BedLocker electric bed cover, Hellwig 1 1/4 inch rear anti-sway bar, 2017 G37 Turbo, ATS Stage I towing transmission kit, White Platinum w/Adobe, Navigation, Moon Roof, 5th Wheel Prep, Step Tail Gate, front 2 inch receiver, completely insulated, Pioneer speakers, King Ranch Package

'99 E-350 HiTop Companion Van Conversion, 7.3 SD Diesel, 5-tune DP Tuner, Triple AutoMeter C2 A-pillar gauge pod, dash mount AutoMeter C2 fuel pressure gauge, twin K&N's, 203* mod, Deraler tubed trannie pan, B&M trannie cooler, AirLift air bags, Bilsteins, 4" DiamondEye turbo back exhaust, Air Dog fuel filtration system, Hutch mod, header wrapped and high temperature painted Bellowed Up-Pipes.
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post #6 of 7 (permalink) Old 08-25-2019, 12:38 PM
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I was just using that as an example of how a sending unit can fail making you think you have a problem when you donít.


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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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post #7 of 7 (permalink) Old 08-25-2019, 01:01 PM Thread Starter
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I misunderstood. I’m not sure where to even begin to troubleshoot. I may have to take it to the Ford garage.

2012 F-350 SD Crew Cab, SRW, LWB, 4 X 4, FX4 Offroad, Bilsteins and Bilstein Steering Stableizer, AirLift Air Bags with onboard compressor, BedLocker electric bed cover, Hellwig 1 1/4 inch rear anti-sway bar, 2017 G37 Turbo, ATS Stage I towing transmission kit, White Platinum w/Adobe, Navigation, Moon Roof, 5th Wheel Prep, Step Tail Gate, front 2 inch receiver, completely insulated, Pioneer speakers, King Ranch Package

'99 E-350 HiTop Companion Van Conversion, 7.3 SD Diesel, 5-tune DP Tuner, Triple AutoMeter C2 A-pillar gauge pod, dash mount AutoMeter C2 fuel pressure gauge, twin K&N's, 203* mod, Deraler tubed trannie pan, B&M trannie cooler, AirLift air bags, Bilsteins, 4" DiamondEye turbo back exhaust, Air Dog fuel filtration system, Hutch mod, header wrapped and high temperature painted Bellowed Up-Pipes.
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