fuel pump bad??
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Elder User
Joined: Jan 2008
Posts: 657
Likes: 2
From: 602
fuel pump bad??
i was dxriving my truck then all sudden truck started losing power then slowly died i restartedx it it was a lil shacky then died again i unscrewedx the fuel filter and lookedxin the housing and there was lil fuel in bowl i turned the key to on position and bowl did not fill with fuel lookedx as if it were shooting some bubbles up(air) could it be outta of fuel???
Cargo Master
Joined: Feb 2005
Posts: 2,837
Likes: 1
Do you not know if you ran out of fuel? If not, that would be the first place to start. If it's not out of fuel, it is either the pump or a restriction in the lines somewhere. When you turn the key to the ON position (without cranking the engine) can you hear the fuel pump humming for about 10 seconds? Most make a little noise. It may help if you have a buddy lie under the truck and look at the pump while you turn the key on. It will be obvious if it is working when you turn the key on if you are looking at it. Typically these pumps either quit working all together, or work fine. Rarely any in-between. Let us know what you find and we will get you running again soon.
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Elder User
Joined: Jan 2008
Posts: 657
Likes: 2
From: 602
Do you not know if you ran out of fuel? If not, that would be the first place to start. If it's not out of fuel, it is either the pump or a restriction in the lines somewhere. When you turn the key to the ON position (without cranking the engine) can you hear the fuel pump humming for about 10 seconds? Most make a little noise. It may help if you have a buddy lie under the truck and look at the pump while you turn the key on. It will be obvious if it is working when you turn the key on if you are looking at it. Typically these pumps either quit working all together, or work fine. Rarely any in-between. Let us know what you find and we will get you running again soon.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 27
From: Mesa AZ
Yep. The fuel pump is also pretty good at pumping air as well. When the fuel supply is exhausted, it will suck air through the fuel line connector between the pump and the tank.
Like Bob said, the fuel pumps are good one day and dead the next. They usually don't function in a partial capacity.
You might try getting yourself a jug of diesel fuel and manually plumbing it to the back of your fuel pump (make sure you use an inline filter of some sort). Cycle the key about 3 times and then start the engine. If it starts and idles fine then you will probably need to drop your tank and clean the screens (or perform the in-tank mods).
This is a fairly common issue.
Here is a link.
Welcome to guzzle's In-tank Hutch Mod Web Page
Like Bob said, the fuel pumps are good one day and dead the next. They usually don't function in a partial capacity.
You might try getting yourself a jug of diesel fuel and manually plumbing it to the back of your fuel pump (make sure you use an inline filter of some sort). Cycle the key about 3 times and then start the engine. If it starts and idles fine then you will probably need to drop your tank and clean the screens (or perform the in-tank mods).
This is a fairly common issue.
Here is a link.
Welcome to guzzle's In-tank Hutch Mod Web Page
Thread Starter
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Elder User
Joined: Jan 2008
Posts: 657
Likes: 2
From: 602
checked fuel pump its working so i jus added 5 gallons of fuel and it started right up ran like **** for about 15mins(proably air in lines) and smoothed right out i guess i need to look at my sending unit instead lol thx fellas and im gonna drop the tank and mod the sucker
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
You will probably find that the fuel pick up foot has deteriorated. It's become a more common problem as these trucks age. I did the in-tank mods about three years ago and didn't replace the pick up foot. 
It will fall apart sooner or later.
It will fall apart sooner or later.
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Elder User
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From: 602
is there a link to in tank mod
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86 f350 6.9 idi
i have a question on my 6.9 idi. The truck shakes when running and is getting harder to crank. I just replaced the fuel filter screw on type today and it looked like muddy water and smelt like old gas which is diesel ofcourse. Then tried starting after i refilled new filter with clean diesel and nothing even bled injectors and a few air bubbles came out. Still wont crank. I disconnected the mechanical lift pump from the fuel filter the hard line on the lift pump itself and turned engine over and nothing came out. I have 3/4 a tank of fuel atleast. Bad lift pump?????? Thanks in advance.
Fleet Mechanic
Joined: Aug 2006
Posts: 1,465
Likes: 17
From: Jacksonville, FL
First, this thread is 5 years old, secondly you may want to put this in the appropriate forum for the year of your truck......
This forum is for the 99-03 powerstroke diesels, the fuel system on your truck is different to ours, we have electric rail mounted fuel pumps, whereas yours is a mechanical type.
This forum is for the 99-03 powerstroke diesels, the fuel system on your truck is different to ours, we have electric rail mounted fuel pumps, whereas yours is a mechanical type.
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oldman47
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
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Jan 2, 2009 01:25 AM
