My 2006 f150 won't start. it's clearly a fuel problem. i've removed and tested the fuel pump it's fine. my next step is to check the fuel pump relay but i'can't find it in either the cab fuse box or aux relay box. also is there any other switch that may cut out the fuel pump other than the emergency cut-out switch next to the in cab fuse box? if so could someone point me towards that as well?
The Fuel pump relay is a non serviceable relay ( built into the fuse panel ) in the 04-08 MY F-150s.
Did you check the Fuel Inertia switch ( in the passenger side kick panel by the fuse panel ) ?
If you are having a no fuel pressure issue, might want to take a look at the FPDM ( Fuel Pump Driver Module ) on the cross member above the spre tire ( need to drop the spare to see if ).
There is an issue with 04-07 ( 04-06 ?? ) MY trucks where the FPDM is bolted directly to the cross member, and dissimilar metal corrosion happens and builds up behind the FPDM, causing it to break.
Here are some before and after pictures from my 2006, I replaced mine for the heck of it and found that the case had cracked with ~ 51K miles on it, soon the PCB would have cracked leaving me stranded
This is the kit I got ( check that the Part Number has not been changed )
Testimonial: "thanks for the tip i'll check it out. i've tried to reset the fuel cut-out but it's hard to tell if it resets and finding a test point to prove it is well.... daunting. i have no fuel pressure whatsoever and the fuel pump will not run although it will if i put 12v directly to the fuel pump motor so i know it's not the fuel pump."
That sounds like the FPDM. It takes the power from the fuel pump relay through the fuel inertia shutoff switch and input from the PCM to power the fuel pump.
The circuit is :
Fuse #9 to the Fuel pump relay Common terminal ( i.e. relay pin #30 ).
Fuel pump relay Normally open terminal ( i.e. relay pin #87 ) to the Fuel pump inertia switch ( on a Dark Green w/ Yellow stripe wire
Fuel Inertia switch output ( White wire ) to the FPDM.
So if you want a test, with the key in the run position, you should have power on both the Dark Green w/ Yellow stripe wire
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Check the wire group on the frame rail under the drivers side it should be behind a plastic shield Ive had to repair 2 they were both 07 f150 4x4s
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