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Old 09-23-2013, 10:27 AM
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Question Low Fuel Pressure

Oh guys and gals I am battling low fuel pressure. I have been fighting this for over a year and still not getting anywhere. I have replaced the HFCM twice (Last time was just a new pump) My fuel pressure ranges from 43 to 55 at idle and 35-55 WOT. I have done the regulator rebuild with a blue spring after the first HFCM and it kept it from dropping below 45psi. Then this summer while pulling the boat (4100lb load boat+trailer+gear) it went crazy and would bounce from 20psi to 60psi. I bought a new pump thinking it might be going bad and now I am back to staying above 42psi. I change the filters every other oil change (9-11000 miles) and always use motocraft filters. This is a stock truck no tuner (Won't hook it back up until fuel issue is solved). I am going to test FICM voltage this weekend and see what it shows. Does anyone know if there is a screen in the tank that could be plugged or restricted? Just want to try and weed out the free and cheap stuff first.

Any advice would be great.

Thanks
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Old 09-25-2013, 12:42 AM
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What are you using to read your fuel pressure . And where is the fuel gauge hooked up? I can't tell you how many times I've seen guys replace parts when it turns out to be the fuel gauge. When fuel pressure is "bouncing" during steady throttle (either idle or WOT) it's usually the gauge. At very least test the gauge or hook put a borrowed one on there.
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Old 09-25-2013, 01:07 AM
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The gauge is hooked up to the test port on the filter housing. I've used 3 different gauges. Even an ol trusty mechanical.

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Old 09-25-2013, 05:05 AM
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Some year trucks have filter screens in the tank at the inlet. IIRC its 2003-2005 but don't quote me on the model years that do.
With that problem fuel pressure is usually ok at idle then drops away under throttle.
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Old 09-25-2013, 07:41 AM
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[QUOTE=mhatlen;6729905]Some year trucks have filter screens in the tank at the inlet. IIRC its 2003-2005 but don't quote me on the model years that do.
With that problem fuel pressure is usually ok at idle then drops away under

Ok thanks.
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Old 09-27-2013, 06:58 AM
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Ok so I changed filters again and idle its at 50psi wot it bounces from 60 to 40 and keeps bouncing. Any ideas?

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Old 09-27-2013, 07:17 AM
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Did you check the intake screen IN the tank like was suggested?


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Old 09-27-2013, 07:53 AM
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Haven't made it that far. Have a 2 hr drive home then I'll do that.

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Old 09-27-2013, 08:27 AM
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When you do drop the tank it's a real good time to install a sump and do the harpoon mod.


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