Foaming Fuel
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Senior User
Joined: Jan 2013
Posts: 105
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From: Suffolk, VA
Foaming Fuel
I've found a few threads but final outcome was posted. 2004.5 Ex with 6.0, and when we purchased it the water in fuel light was on. Fixed that by draining the tank and cleaning it out. I used the HFCM to remove fuel from the tank and found foam coming out of the HFCM. I put a tube on inlet and outlet from a bucket of fuel to eliminate the lines from the tank and have same amount of foam. I replaced the filter, cap(mangled by PO), manifold(had crud in it) and drain plug(had threads gone). I pulled the HFCM and vacuum checked at all 4 lines, use 10 psi shop air and soap/water to leak check and didn't find any leaks. Fuel pressure at idle is 57, WOT is 51. I have a blue spring kit but wanted to fix the foaming first. Can the pump itself be bad because of the water that was in the system? I literally have no other issues with the truck.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
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From: Spanaway
Two lines on tha tank side are one suction and the other hot fuel return to tank.
On the engine side you have pressure feed and a return from the pressure regulator.
There is a test for fuel aeration. I don't have the PDF handy. You will find the info
in your year PC/ED book. It's the black book in the shop manual set.
On the engine side you have pressure feed and a return from the pressure regulator.
There is a test for fuel aeration. I don't have the PDF handy. You will find the info
in your year PC/ED book. It's the black book in the shop manual set.
Thread Starter
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Senior User
Joined: Jan 2013
Posts: 105
Likes: 1
From: Suffolk, VA
Turns out that was exactly what I needed to do. Did that and the KOEO to check the filter bowl, then did the bubble test. All good. Guess I was being a little paranoid about ruining injectors. Thanks!
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