Rough idle and shuts off when fuel tank gets slightly below the halfway mark?

SEANJARNAGIN70

MEMBER
2000 FORD F-150
5.4L
V8
4WD
AUTOMATIC
155,000 MILES

Idles rough but doesn't shut off, accelerates fine until you get to 55MPH then while cruising it acts like its stuttering. Kick it into passing gear and stuttering goes away. Although sometimes you have to press the gas pedal pretty far to get it to down shift. No engine codes. Also, when it gets down to just under 1/2 tank of gas it shuts off. It will restart and run a short distance before shutting off again.

7 Replies

SEANJARNAGIN70

MEMBER
5 POSTS

Also, I don't think I hear the fuel pump, but I hear the relay click. Then a few seconds after the relay clicks, I hear a click clunk somewhere on the driver's side of the engine.

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Wednesday, July 20th, 2022 AT 6:25 PM

SEANJARNAGIN70

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Again, no check engine light but I pulled these codes fuel gauge works. Brake light works. Has new spark plugs and ignition coils about 3,000 miles ago.

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Wednesday, July 20th, 2022 AT 6:28 PM

KEN L

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So, I noticed the VSS sensor fault does the speedometer work? If not, I would start there with replacement the VSS here is the location in the diagrams below. Also, it does sound like the fuel pump is going out, so I have included instructions on how to change that out as well. Here is a generic guide to help you see what you are in for when doing the job:

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Check out the diagrams (below). Please let us know what happens.

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Thursday, July 21st, 2022 AT 12:13 PM

SEANJARNAGIN70

MEMBER
5 POSTS

Hey Ken, thank you for your response. The speedometer works. I changed out the fuel pump along with the fuel pressure regulator and fuel filter. I was mistaken earlier when I said the fuel gauge worked. It works now lol. But I still have a rough idle and a shudder when I try to accelerate from a cruising speed. When I kick it down a gear, it accelerates fine. Also. Prior to changing these parts my fuel pressure was 32 with ignition on. And 30 running. It's still the same fuel pressures after changing these parts. Also, when I turn the ignition on, I still hear a small clunk after a few seconds that seems to come from the driver's side of the engine bay.

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Sunday, July 24th, 2022 AT 9:20 AM

KEN L

MASTER CERTIFIED MECHANIC
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Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response.