Fuel pump run time?
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Cross-Country
Joined: Apr 2002
Posts: 68
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From: Arizona
Fuel pump run time?
TLDR: Does your fuel pump run 20 seconds EVERY TIME? Or does it build up to a pressure and then stop sooner?
2001 F250 7.3 diesel, 210000 miles. As of Monday, after replacing the starter, it has begun to refuse to start. Mostly. Cranks and cranks, but won't catch.
When I replaced the starter I didn't properly disconnect the batteries, causing some momentary sparks. I then properly disconnected them and finished the job. So I may have mucked something up.
SOMETIMES it will start, see video attached. When it starts, it runs fine. No miss, idles, pulls like it should. Turn it off, it starts right up again.
Fuses all ok, no codes, dash lights work as normal. New fuel filter. RPM dial jumps while cranking, so CPS is ok.
I live in the desert and the two times I've gotten it to start, it seems to start when it gets hot enough. Maybe the glow plugs aren't working? Maybe the fuel bowl heater?
I noticed that the fuel pump runs when you turn it on for the full 20 seconds every time. I don't recall that being the case before, but I dunno.
I'm grasping at straws here.
2001 F250 7.3 diesel, 210000 miles. As of Monday, after replacing the starter, it has begun to refuse to start. Mostly. Cranks and cranks, but won't catch.
When I replaced the starter I didn't properly disconnect the batteries, causing some momentary sparks. I then properly disconnected them and finished the job. So I may have mucked something up.
SOMETIMES it will start, see video attached. When it starts, it runs fine. No miss, idles, pulls like it should. Turn it off, it starts right up again.
Fuses all ok, no codes, dash lights work as normal. New fuel filter. RPM dial jumps while cranking, so CPS is ok.
I live in the desert and the two times I've gotten it to start, it seems to start when it gets hot enough. Maybe the glow plugs aren't working? Maybe the fuel bowl heater?
I noticed that the fuel pump runs when you turn it on for the full 20 seconds every time. I don't recall that being the case before, but I dunno.
I'm grasping at straws here.
Last edited by mcgyver42; Mar 26, 2026 at 03:20 PM.
Lead Driver
Joined: Aug 2022
Posts: 5,053
Likes: 1,410
From: Oologah, OK
the PCM commands it to run for ~20 seconds and IF the engine has not started, it times out.
that is normal.
the Fuel Bowl return excess fuel to the tank, that is normal also.
that is normal.
the Fuel Bowl return excess fuel to the tank, that is normal also.
Last edited by John in OkieLand; Mar 26, 2026 at 03:35 PM.
Lead Driver
Joined: Jun 2004
Posts: 6,317
Likes: 583
From: Amarillo, TEXAS!
20 seconds at key on. Runs continuously while signal is detected from the CMP sensor. Times out after 20 seconds if CMP signal is lost, but shuts off immediately if the key is turned off.
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