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FREEDGUY 
Orange Level Access
Joined: 15 Apr 2017
Location: South West Mich
Points: 5391
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 Topic: What Part Is This ....
Posted: 31 Oct 2020 at 7:49pm |
on an '05 F250 with 5.4? The truck died on me on the way to work yesterday. Engine would crank and sporadically catch/cough for 2 seconds and die  . I was pretty confident it was the fuel pump and after having it towed to my mechanic, an "initial" diagnoses with gauges said the same  .Later in the afternoon, I got a call saying "FIXED" and $500 less than estimated  ,turned out to be some type of "relay" mounted on the frame close to the tank?? I was pretty sure there's a relay in the box under the hood, but is this underbody module "standard equipment" on all chasis or just a chasis for aftermarket bodies (service body, ambulance, tow truck) ? My guy said that this module "variated" the speed of the electric pump as far as fuel demand ?? Any truth to that ??
Edited by FREEDGUY - 31 Oct 2020 at 7:50pm
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 77731
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Posted: 31 Oct 2020 at 7:58pm |
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There is a small black box called a FUEL MODULE that is bolted to the frame above the left rear tire.. it is about 2 inches square and has 4 wires running to it... It "monitors" the fuel rail pressure and tells the fuel pump when to START and STOP... There is no longer a REGULATOR in the system.......... Pretty common for these to ROT OUT due to salt spray after 10 years..
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Like them all, but love the "B"s.
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FREEDGUY
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Joined: 15 Apr 2017
Location: South West Mich
Points: 5391
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Posted: 31 Oct 2020 at 8:09pm |
Thanks Steve  ! That explains the 2 rusty bolts and washers I found on the rear bumper this afternoon after 35 miles of driving  . I had no idea of where this part was mounted to the frame  .
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 21466
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Posted: 31 Oct 2020 at 8:54pm |
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hay I was talking to neighbour about that 'black box' when I lifted the pickup box off with my A-C forklift. He said VERY COMMON to fail,keeps a spare on the shelf..just in case....
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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FREEDGUY
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Joined: 15 Apr 2017
Location: South West Mich
Points: 5391
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Posted: 31 Oct 2020 at 9:24pm |
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The mechanic gave me the old "box", but it was 3"s long, an 1&1/2" tall and mostly silver colored metal with a black plastic cover and at least 6 "pins" in the electric socket ??
Edited by FREEDGUY - 31 Oct 2020 at 9:24pm
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 77731
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Posted: 31 Oct 2020 at 10:06pm |
yep........ i was just rounding off the numbers !!. .. It has an aluminum case on the back.. SALT gets to it and eats a hole thru to the circuit board.. You cant see it from the front, only the black plastic... Aluminum back should have a hole or rotten spot.
Edited by steve(ill) - 31 Oct 2020 at 10:14pm
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Like them all, but love the "B"s.
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john(MI)
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Joined: 12 Sep 2009
Location: SE MI
Points: 9263
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Posted: 01 Nov 2020 at 11:20am |
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They should fill the case with that stuff they used to use, The salt wouldn't get thru that stuff. It was a gold colored plastic like stuff. But by not doing it they get more profit.
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D14, D17, 5020, 612H, CASE 446
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FREEDGUY
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Joined: 15 Apr 2017
Location: South West Mich
Points: 5391
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Posted: 01 Nov 2020 at 5:39pm |
 steve(ill) wrote:
yep........ i was just rounding off the numbers !!. .. It has an aluminum case on the back.. SALT gets to it and eats a hole thru to the circuit board.. You cant see it from the front, only the black plastic... Aluminum back should have a hole or rotten spot.
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That's the part Steve, but my old one (looking at it right now) has 2 tiny round terminals in between the 2 sets of spade terminals ?? OEM Part # zt2536065 ? Thanks for the picture !!
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Hubert (Ga)engine7
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Joined: 12 Sep 2009
Location: Jackson Cnty,GA
Points: 6126
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Posted: 01 Nov 2020 at 6:45pm |
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Steve, would a '99 F150 with the 5.4 use basically the same module. Mine is not giving any problems but that is good information to file away. Rock Auto doesn't show one and Car Parts.com has a "voltage booster" for almost $500. Thanks for sharing your knowledge.
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Just an old country boy saved by the grace of God.
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