Fuel pump?
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Junior User
Joined: May 2011
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From: Western KY
Fuel pump?
My truck (2005 Excursion, 4x4, 6.0) wouldn't start when my FIL and MIL went to visit my daughter for lunch at school. I towed it home when I got home from work. Batteries seemed fine and the truck would crank fine. When I would put the key to the "on" position, the fuel pump would kick on for what seemed to be an excessive amount of time...maybe 20-30 seconds. I thought that was odd so I pulled the top fuel filter and asked my dad to turn the key to the "on" position to see if fuel was cycling to the filter. I got nothing. My hunch is saying a fuel pump but I am not confident because I can hear it pumping (or what I assume is the fuel pump).
What say you?
What say you?
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
Could be the crash valve. You just push the button to reset that. I think it is behind the passenger side kick panel.
Definitely a fuel supply problem if it won't fill the upper bowl. Normally I would think it is the pump, but if the pump is running for 30 seconds and then turning off, that would seem to say that it is reaching the pressure limit. BTW, running for 30 seconds after you cycle the key ON is normal.
Definitely a fuel supply problem if it won't fill the upper bowl. Normally I would think it is the pump, but if the pump is running for 30 seconds and then turning off, that would seem to say that it is reaching the pressure limit. BTW, running for 30 seconds after you cycle the key ON is normal.
Logistics Pro
Joined: Mar 2007
Posts: 4,604
Likes: 4
From: Claremore, OK
Your not confusing the injector coil buzzing with the fuel pump are you?
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Junior User
Joined: May 2011
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From: Western KY
I will try the cut off switch behind the panel. I will also check the HFCM. Thank you for the heads up.
Hotshot
Joined: Aug 2006
Posts: 17,398
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From: Whittier, CA
Okay, don't confuse the sound of the vacuum pump with the fuel pump. Both will run for some time after you turn the key on. To be sure the fuel pump is running, turn the key on and quickly stick your head under the truck. Maybe lay a hand on it. No, not to heal it, just to feel for vibrations.
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Logistics Pro
Joined: Mar 2007
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From: Claremore, OK
I just wanted to make sure we're on the right line of thought.
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Hotshot
Joined: Aug 2006
Posts: 17,398
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From: Whittier, CA
Definitely true. But the question is, if it is not building a head of pressure, will it shut off? Honest question, and I don't know. Normally it runs until pressure builds (approx 100psi) then it shuts down until the pressure is reduced, then starts again. Logic would say that if it doesn't build line pressure, it will run endlessly.
Lead Driver
Joined: Sep 2007
Posts: 8,180
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From: Scio, OR
Since there is no fuel pressure gauge, the pump can't run until it builds pressure and shuts off. It doesn't know when pressure is built.
The pump runs for a predetermined about of time and then shuts off. If you wait long enough for it to shut off, it will turn back on as soon as you crank the engine and it runs all the time the engine is running.
The pump runs for a predetermined about of time and then shuts off. If you wait long enough for it to shut off, it will turn back on as soon as you crank the engine and it runs all the time the engine is running.
Hotshot
Joined: Dec 2003
Posts: 15,368
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From: Stuttgart, Ar
1). Verify that the fuel tank has plenty of fuel
2). Verify that the pump is running
a) check the emergency shutoff
b) check fuse/relay
3). Verify filter condition
a) length of time since last filter change
If all the above are "good" then either the pump has gone bad or your fuel pickup is "missing" or restricted.
2). Verify that the pump is running
a) check the emergency shutoff
b) check fuse/relay
3). Verify filter condition
a) length of time since last filter change
If all the above are "good" then either the pump has gone bad or your fuel pickup is "missing" or restricted.
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Junior User
Joined: May 2011
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From: Western KY
I have switched the fuel filters, verified fuel at the top filter and still will not start. I put the meter on the batteries and it read 12.1v, so now I am off to Sams Club to spend $170!!
Logistics Pro
Joined: Mar 2007
Posts: 4,604
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From: Claremore, OK
You don't have a battery charger? Don't get me wrong, there's nothing wrong with new batteries. But why replace 'em if they're not the problem in the first place?
Hotshot
Joined: Aug 2006
Posts: 17,398
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From: Whittier, CA
When your upper bowl was empty, and you were cranking the starter, you probably now have air in the fuel rails/injectors. That can take a lot of cranking to purge all the air through the injectors. Expect it to be very hard to start even if the fuel pump is now working.
Thread Starter
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Junior User
Joined: May 2011
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From: Western KY
First you said you did not get fuel in the upper bowl. Now you do have fuel. So maybe something is intermittent. New batteries can't hurt, but that is probably not the issue here. Do you think the fuel filters were the problem? Or an intermittent fuel pump?
When your upper bowl was empty, and you were cranking the starter, you probably now have air in the fuel rails/injectors. That can take a lot of cranking to purge all the air through the injectors. Expect it to be very hard to start even if the fuel pump is now working.
When your upper bowl was empty, and you were cranking the starter, you probably now have air in the fuel rails/injectors. That can take a lot of cranking to purge all the air through the injectors. Expect it to be very hard to start even if the fuel pump is now working.
It was very cold (11°) the night before it quite running. Not sure what that could do with it but thought that I would through that out.