2000 f150 5.4 won't start, fuel pump?
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Lead Driver
Joined: Apr 2001
Posts: 6,175
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From: Texas
2000 f150 5.4 won't start, fuel pump?
2000 F150 with 5.4, struggled one time last week, but managed to start after a few tries. then yesterday it stranded me in a parking lot. sounds like it's not getting fuel. 120,000 miles. is it common for the fuel pump to give up on these trucks? I assume it's in the tank and a real bear to change. looks like the pump is pretty cheap.
G
G
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Prove the pump is the cause before you take anything apart.
Test for fuel pressure at the fuel rail port.
It needs to be 35 to 40 psi running then hold that pressure for at least 5 min or more after shut off.
Key to run starts the fuel pump for a couple seconds then it stops.
Key on again and it should run a couple seconds again to build more pressure.
At cranking, the pump runs full time.
Good luck.
Test for fuel pressure at the fuel rail port.
It needs to be 35 to 40 psi running then hold that pressure for at least 5 min or more after shut off.
Key to run starts the fuel pump for a couple seconds then it stops.
Key on again and it should run a couple seconds again to build more pressure.
At cranking, the pump runs full time.
Good luck.
Thread Starter
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Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
pump and filter replaced. did it the hard way, like i do most things; dropped the tank. anyway, it's running smooth again :-) one less fire to put out for now. Home A/C is on the fritz and the viper won't hold a charge.
1st Gear
Joined: Jul 2024
Posts: 1
Likes: 0
Pressure Port
Prove the pump is the cause before you take anything apart.
Test for fuel pressure at the fuel rail port.
It needs to be 35 to 40 psi running then hold that pressure for at least 5 min or more after shut off.
Key to run starts the fuel pump for a couple seconds then it stops.
Key on again and it should run a couple seconds again to build more pressure.
At cranking, the pump runs full time.
Good luck.
Test for fuel pressure at the fuel rail port.
It needs to be 35 to 40 psi running then hold that pressure for at least 5 min or more after shut off.
Key to run starts the fuel pump for a couple seconds then it stops.
Key on again and it should run a couple seconds again to build more pressure.
At cranking, the pump runs full time.
Good luck.
Fleet Mechanic
Joined: Jun 2023
Posts: 1,352
Likes: 373
From: WA
The internet says that 07 uses the electronic pressure sensor on the rail. Should be readable by scanner.
Shows the reading at about 5:00 if it doesn't start there. I didn't watch it to the end, not so sure about the guy's logic. But it does show the sensor reading on his scanner.
Shows the reading at about 5:00 if it doesn't start there. I didn't watch it to the end, not so sure about the guy's logic. But it does show the sensor reading on his scanner.
Hotshot
Joined: Jul 2020
Posts: 10,268
Likes: 2,563
From: Near Salt Lake City
Well, replacing the battery on the Viper and taking it for a drive sounds fun
Good luck on the house HVAC
Note
If you unplug the fuel rail pressure sensor it forces the pump to a 100 percent duty cycle
Good luck on the house HVAC
Note
If you unplug the fuel rail pressure sensor it forces the pump to a 100 percent duty cycle
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dirt_bag
1987 - 1996 F150 & Larger F-Series Trucks
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Mar 30, 2023 10:32 AM
