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Apr 14, 2020 | 03:01 PM

Catfishious

Thread Starter

4wd Low

Joined: Apr 2020

Posts: 13

Likes: 0

Won't start

2002 F350 Super Duty 5.4
My truck just died going down the road yesterday and won't start again. It had been doing this off and on but always started back up. Any suggestions?

Apr 14, 2020 | 05:01 PM

seville009

Logistics Pro

Joined: Nov 2004

Posts: 4,795

Likes: 47

Since it died while running, first suspect would be in the fuel/fuel delivery system.

could also be that the alternator isn’t working and the battery died, but presumably you would have had a light on your dash pop up. Check the battery voltage.

check for codes first though in case it’s something simple

Apr 14, 2020 | 06:55 PM

Djosbun

Fleet Mechanic

Joined: Oct 2017

Posts: 1,704

Likes: 164

From: Southwest Ohio

It could be 20 different things. It's not possible to give any help that's not solely a guess with such minimal information, unless you just want guesses to work off of.

I'll start: broken wire in the harness that powers the fuel pump control module due to rodent chewing or large road debris. Vibration causes connection issue at the wire damage point.

Next.

-- Dave

Apr 15, 2020 | 12:53 PM

Catfishious

Thread Starter

4wd Low

Joined: Apr 2020

Posts: 13

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More

Thanks for the tips, but it's not the battery or fuel pump. Truck still turns over but she sounds as if there isn't fire going to the plugs. I had issues of this nature before and changed the CPS. IT seemed to fix it, but about two weeks later it gradually started again. Now all she does is turn over.

Apr 15, 2020 | 06:34 PM

99f350sd

Lead Driver

Joined: May 2003

Posts: 9,303

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From: Lyndonville, Vermont

Listen for the fuel pump for 2 secs with key on..

Apr 17, 2020 | 03:04 AM

Catfishious

Thread Starter

4wd Low

Joined: Apr 2020

Posts: 13

Likes: 0

Big thanks

Quote:

Originally Posted by Djosbun

Ok, so it wasn't a wire problem, but it was the fuel system. Fuel relay to be exact. Something is still not quite right, but at least I can get to work,and to the service calls. Thanks for the help. Because my scan tool won't give a reading if the truck isn't running. Changed out the fuse panel, which includes the fuel relay built in. It's beyond me why they would do that, but I'm not a car and truck designer.