HFCM Problem

[Joeshu1000]

So I am running Matt's SRLXX and found that it's a little weak on the top end. I installed a fuel pressure gauge and found that at WOT my fuel pressure is dropping down just below 30PSI. Normal driving or anything less than half throttle the fuel pressure stays between 50-60PSI. The truck has 140K so I am going to replace the HFCM. But after doing some research I found that you can just by the pump and or the whole HFCM. Would it be better to replace the whole unit or take it off and just replace the pump portion? Thanks in advance.

[Karls03]

A new fuel pump/HFCM will fix this issue. When I was shopping for an HFCM, I found that a complete Carter unit was only a few bucks more than just a pump, so I bought it.

The fuel lines require a special tool, it's not that expensive, the feed lines are 3/8 and the returns are 5/16. This tool is for ALL FOUR LINES! I thought I saw a clip on one line and destroyed the fitting. GRRRRR!!

[Joeshu1000]

Originally Posted by Karls03

A new fuel pump/HFCM will fix this issue. When I was shopping for an HFCM, I found that a complete Carter unit was only a few bucks more than just a pump, so I bought it.

The fuel lines require a special tool, it's not that expensive, the feed lines are 3/8 and the returns are 5/16. This tool is for ALL FOUR LINES! I thought I saw a clip on one line and destroyed the fitting. GRRRRR!!

So I got the fuel pump out, but destroyed one of the fitting on the tank side. What did you do to fix it. I called ford and they wanted to see me the line all the way to the tank and wanted almost $400. I was thinking of cutting the line and routing my own up to the pump.

[Karls03]

I ended up trashing the upper left fitting as you are looking at the HFCM (fuel in). I went to Auto Zone, got some EFI rated rubber hose (that's what is in there so why not) and some EFI hose clamps. These clamps put more of an even load on the hose than a typical band clamp.

At any rate, get a razor, shave away at the end of the hose where it meets the steel line, install hose and clamps, and off you go.

I laughed when I read this because I know EXACTLY what you were feeling when you broke it and when Ford told you they wanted $400 for that stuff.

[Joeshu1000]

Originally Posted by Karls03

I ended up trashing the upper left fitting as you are looking at the HFCM (fuel in). I went to Auto Zone, got some EFI rated rubber hose (that's what is in there so why not) and some EFI hose clamps. These clamps put more of an even load on the hose than a typical band clamp.

At any rate, get a razor, shave away at the end of the hose where it meets the steel line, install hose and clamps, and off you go.

I laughed when I read this because I know EXACTLY what you were feeling when you broke it and when Ford told you they wanted $400 for that stuff.

That makes me feel much better that I'm not the only run who has run into that problem. I'm gonna get it back together in the morning. Thanks.

[Joeshu1000]

Seemed to fix the fuel pressure issue.


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[Karls03]

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