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Fuel pump problem??

2K views 15 replies 5 participants last post by  AWD Bare 
#1 ·
Here's my problem and diagnosis. I need a reassurance from ya'll to see if I am on the right path.

About 2 weeks ago, I was coming back from a 60 mile trip and noticed my truck was starting to hesitate. I was going steady at 75 mph. So I thought maybe the filter and water seperator was the suspect. Then I remembered I got fuel out of a tank from a buddy of mine, well, the tank was almost empty and I know I got some sediment from it. The proof was in my filter bowl on the top of the motor.So I cleaned it out, replaced the filter and whatnot and drove the next day.

So, on my way home, I get on the interstate and she's chugging real bad. Steering wheel is shakin, barely staying at 50 mph and starting to leave a small cloud of white smoke.Feels like it's dying for fuel. I let off the pedal and it stops, get back on it and it keeps on happening. I make it home.

Today, I start looking. I think its my fuel sending unit under the driver's side door, but it was making a whining noise for about 5 seconds after the glow plugs heat up. Just to use for a gauge of time to how long it will whine when I turn the key.

So I take it out, monkey around with it for a minute and see nothing incriminating. For the peace of mind, I want to know if the pump in the tank has went bad. I put the fuel line in a clear glass bottle, turn the key and no fuel comes out. I double check everything and try again to have the same results.

My question is, will the fuel pump work without the sending unit being hooked up? Are they linked together electronically somehow? And is the little aluminum looking cylider coverd in black rubber foam, under the drivers side door, the sending unit?

I did not check for electric to be at the pump in tank, but I am confident nothing has been goofed around with.

Sorry for the long discription but I am trying to give the best description I can. What do you guys think?
 
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#3 ·
The fuel pump and the sending unit are not hooked together.

The fuel gauge sending unit is in the tank. The fuel pump is on the driverside frame rail in the location you describe. There is NO PUMP in the TANK.

You were messin with the pump. Which could be bad but before you buy a new one. Do a flow test on the one you have. Also do a pressure test on it.
 
#4 ·
So there is no pump in the tank? It has electric wires going to it.
 
#5 ·
There is a fuel gauge sending unit in the tank. That is what the electrical wires going to the tank are for.

Before you get into deep I suggest you buy a repair manual for your truck.
 
#8 ·
I know, I have just not needed one for it yet. I wanted to see if it was worth me taking it to a diesel shop or doing it myself. I still have 9000 miles of extended warranty left. Lucky for me, I let my wife talk me into it !:crazy:

But there is something going on with it that I am not sure what it is and gotta get it fixed.... off to the shop I guess:doh:
 
#9 ·
You got warranty might as well get your money out of it. Let them fix it for you. If you have to pay a deductible it will be cheaper then the new pump. If you need a new pump.
 
#10 ·
Yea, 100 dollar deductable. I figured a pump was probably 160 or so, I would rather have my truck back faster. But, I would rather have it run longer in the end then I would to have it right now. Ahhhh, chit, gotta drive the wifes Chebby for now LOL

Thanks for your help bro.
 
#11 ·
I believe the pump is around 170 at autozone. But you should take your old one with you. That way you can compare the fittings on the new pump. Some of the pumps that autozone sells has a longer feed fitting on it. Which does not allow the fuel line to connect to the pump.
 
#12 ·
Picked up a book today, GREAT recommendation, I read it for 2 hours on just stuff I thought was intersting. Thanks for the nudge to get one.:)
 
#13 ·
you said you checked the sending unit for flow, which was actually rthe pump and got nothing, thers a filter screen in the tank that may have gotten full of crap so try running the pump off of a bucket of fuel to rule out the pump, it may be difficul,t cuz of the fittings on the pump, also you can pull the filter under the hood and cycle the pump to see if your getting fuel, that will narrow it down to the pump back, the screen in the tank is recommended taken out and replaced w/ a out of tank prepump filter, theres a guy on here that has a mod, i dont know who, just search tank mod, ive cleaned mine out several times before i got rid of it and installed a out of tank filter
 
#14 ·
i had the same problems before. Your fuel pump is one the side of the frame on the driver side under the door. but there is only is screens in your tank to avoid putting sediments in the pump. well those screens plug and it creates resistence. then it smokes the pump. order a kit from itp diesel its called a pre pump filter kit. i ended up replacing the pump and adding the filter kit. the filter kit you bolt on the frame of the truck so if you get any junk fuel and then you replace the filter and your pump is safe. it takes a little time but it is well worth it.
 
#16 ·
Thats why I think it is bad ( the pump ) It is loud for 25+ seconds,I counted today, Until it shuts off electronically. It will just click off, I'm guessing, when the system gets pressurized finally.

It will be at the shop tommorow for sure. I caught so much crap from my buddy that has a 6.0 Stroke. Not to mention my wife has a pink John Deere tag on the front of her Chevy. :doh::hehe:
 
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