Fuel Pressure fluctuations - Ford Powerstroke Diesel Forum
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Old 02-28-2012, 05:39 AM
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Fuel Pressure fluctuations

I'm concerned I might have a plugged filter, my fuel pressure will stay at 66 psi coasting but when I am on it, it can dip into the low 50's and even blink into the high 40's. I have installed a blue spring in the regulator.

My suspicion is my filter may have started plugging, I have only 9500 miles on it, BUT a bad batch of fuel can wreak havoc on the filter.

What do Y'all think?
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Old 02-28-2012, 05:43 AM
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I'd spend the $50 and start with the filters. It'd be better than waiting it out to see what happens and chance burning up an injector or two.... Just my 2 cents.
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Old 02-28-2012, 05:46 AM
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Ether the filters (which I would do first) or the pump.
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Old 02-28-2012, 05:50 AM
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Could be the pump too, but thats $300. I know cuz i just replaced mine. Mine was cutting out at WOT so I did the blue spring mod. Still didnt help. Replaced the fuel pump on the frame rail and WA LA! No more cutting out at WOT!
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Old 02-28-2012, 05:55 AM
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How many miles did you have on the truck before you started seeing pump failures? And did you buy your pump from Tousley Ford or International?
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Old 02-28-2012, 05:57 AM
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well mine has 205,000 but i dont know if it was the original pump. And i just went to the local Autozone to get mine cuz I had to have the truck running. couldnt wait for one to be shipped
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Old 02-28-2012, 06:21 AM
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I notice on your other thread, you installed the fuel sensor right to the test port. In your pictures, the sensor looks to be angled down, there could be a chance that you have air trapped in the sensor giving you a jumpy reading.
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Old 02-28-2012, 06:28 AM
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Good point about the sensor angle, lil pooh. I can bring it up some, but I am limited by the CAC pipe. But, come to think of it, the way it's situated should force air out better than the sensor being angled up, where air can gather. Hey, I can give it a try, nothing to lose.

Is there another place aside from the test port, where you can tap into fuel pressure?
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Old 02-28-2012, 06:45 AM
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Its not a matter of angle, it's a matter of bleeding out any possible trapped air. You would need to cycle the key to prime the fuel psi, then unscrew the sensor enough to bleed the fitting and sensor of air. Then tighten up the sensor to see if it helped.

This may or may not help, but it's worth a try since its free.
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