Fuel @ 27PSI on 3/4 throttle!? - Ford Powerstroke Diesel Forum
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Old 06-27-2011, 10:03 PM
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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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Old 06-28-2011, 05:07 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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Old 06-28-2011, 05:15 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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Old 06-28-2011, 10:51 AM
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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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Old 06-28-2011, 12:20 PM
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Quote:
Originally Posted by Fox Hunt View Post
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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Old 06-28-2011, 01:06 PM
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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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Old 06-28-2011, 04:45 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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