Fuel problems
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Joined: Jun 2019
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Fuel problems
I have a 2004 Ford 250 4x4 and it has been acting up for a long time. It started out where it would stop running while driving for no reason. You could tell it was a fuel thing. But a lot of times while coasting and turning the key off and on a couple times it would start right back up without coming to a complete stop. Did that off and on for a year or so. Then it got progressively worse. Now it does it too many times just going down the road and it stops long enough that you have to coast to a good spot because it will take some time before it will start up again. I have a mechanic who has replaced the fuel pump and has checked all the wiring and grounds. He is researching this but has not come up with anything. Any opinions?
Fleet Mechanic
Joined: Oct 2017
Posts: 1,704
Likes: 164
From: Southwest Ohio
You need to be watching live data so you can see what is changing (fuel trims, O2 sensor voltage, MAF voltage, throttle position, etc.) when the stalling occurs. Then you begin your diagnostics from there.
There's no way to properly guess what is causing your issue. Did your mechanic tell you what he found that led him to replacing the fuel pump? Did he read excessive amperage draw while it was running or low fuel pressure? Or did he guess that it was bad? I've found simple pin fitment issues at the harness connector (especially the fuel pump module connector) that were simple to fix and cost under $5.00 to repair. All you need is a test light or multimeter and start wiggling wires.
There's no magic bullet and most guesses with the parts cannon are wrong, leading to a waste of money and time. Forscan is free software and will record live data while you're driving the truck, as long as you have a laptop and purchase the recommended OBD Bluetooth single.
-- Dave
There's no way to properly guess what is causing your issue. Did your mechanic tell you what he found that led him to replacing the fuel pump? Did he read excessive amperage draw while it was running or low fuel pressure? Or did he guess that it was bad? I've found simple pin fitment issues at the harness connector (especially the fuel pump module connector) that were simple to fix and cost under $5.00 to repair. All you need is a test light or multimeter and start wiggling wires.
There's no magic bullet and most guesses with the parts cannon are wrong, leading to a waste of money and time. Forscan is free software and will record live data while you're driving the truck, as long as you have a laptop and purchase the recommended OBD Bluetooth single.
-- Dave
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