Fuel @ 27PSI on 3/4 throttle!? - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 06-27-2011, 11:03 PM Thread Starter
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Fuel @ 27PSI on 3/4 throttle!?

So my truck is stock except for SRL tuned, never had any problems with my fuel pressure ( I DO have the blue spring). Truck sat for about two days drove it yesterday and noticed my PSI was lower than usual but not below 45. Today pull away from a stop sign and only gave 3/4 throttle and the CTS starts screaming that my fuel psi is at 27! Do a wot run and it goes to about 38psi. Never done this before and dont know why its doing this after sitting for just two days. It is do for a oil change, havent changed it since I bought it. Could the fuel filters make that big of a difference all of a sudden, or is there something else I should look for. Going to put it to stock tomorrow and see if it still occurs.

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MBRP 4" Exhaust, ARPs, Barder Stage 2 turbo, S&B CAI, TSD SPD, Warren Competition transmission, Edge CTS, Coolant Filter, High Idle Mod, CCV Mod, Zoodad, Newton Leveling kit, Fuel Mavericks 20x9 , Pioneer DVD head-unit, JL Stealthbox and JL Slash 500/1v2 amp
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post #2 of 7 Old 06-28-2011, 06:07 AM
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Mine has been acting up from time to time as well sometimes it runs normal psi under throttle and idleing then other days its lower at idle and dips down lower under throttle I've replaced regulators and no change. I'm thinking about a regulated return

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Adam

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post #3 of 7 Old 06-28-2011, 06:15 AM
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I think the OEM regulator is a POS and that's all there is to it.

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post #4 of 7 Old 06-28-2011, 11:51 AM Thread Starter
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Its fine at an idle and everything right at 65psi. Changed it back to stock but havent drove it yet, hopefully I can change the oil and fuel filters today and see if anything changes. I agree it does seem like a weak design too.

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MBRP 4" Exhaust, ARPs, Barder Stage 2 turbo, S&B CAI, TSD SPD, Warren Competition transmission, Edge CTS, Coolant Filter, High Idle Mod, CCV Mod, Zoodad, Newton Leveling kit, Fuel Mavericks 20x9 , Pioneer DVD head-unit, JL Stealthbox and JL Slash 500/1v2 amp
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post #5 of 7 Old 06-28-2011, 01:20 PM
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Its fine at an idle and everything right at 65psi. Changed it back to stock but havent drove it yet, hopefully I can change the oil and fuel filters today and see if anything changes. I agree it does seem like a weak design too.
I have an Airdog II cranked all the way up and still get a 25psi swing when I go WOT. I am sure it is due to the OEM FPR. As soon as the 2 fittings I missed when I ordered my stuff come in that POS will be gone forever.

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post #6 of 7 Old 06-28-2011, 02:06 PM Thread Starter
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That will be interesting to see how that works out for you. Cant wait to hear your results.

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post #7 of 7 Old 06-28-2011, 05:45 PM
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Might be ralated
I installed my fuel pressure gauge the other day and here are the numbers.
Cracking pressure 40
Idle pressure 55
Cruising pressure is above 55
WOT pressure 60

Is it possible that my injectors are sucking fuel in the system that makes the fuel pressure at the filter to be higher at higher demand.


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2005, 6.0L, 6 Spd Std, 3.73 Rear End, F250SD, Extended Cab, 4 x 4 Long Bed. 2008 extension mirrors. GPS/TV/DVD/CD/Rear Cam/Radio installed, Max Energy programer by Hypertech, and Fuel Pressure Gauge. ScanGaugeII for 60 plus XGauges, and MPG. ELC Cat EC-1 Coolant, Pull a 39ft 15500Lbs 5th Wheel Camper Trailer. Mileage Avg is 20MPG, and pulling 12.6MPG.
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