Fuel Flow
Thread Starter
|
Freshman User
Joined: Mar 2010
Posts: 46
Likes: 0
Fuel Flow
Ok, um...first of all, why are there GMC ads all over the ford website? anyway...ok Im having a problem with my 2003 6.0. It will idle fine for hours, but as soon as I start driving it, it will make it about 2 miles and then die (seems like its running out of fuel). If I wait about 5 minutes, it will start again, and run fine all the way home (the same two miles). I changed out the filters. Did a fuel pressure check today and got 52psi.. When it dies, I have taken off the cap to the engine mounted filter, and there is little to no fuel in it. Could it be that my pump is getting the pressure, but not the fluel flow it needs?
Fleet Mechanic
Joined: Jun 2006
Posts: 1,589
Likes: 20
Just look at it as GMC providing economic stimulus $ to this site!
It sounds like a typical gasoline fuel pump failure. Pumps sufficient fuel at idle but will not supply enough fuel at higher RPMs.
Remove the HPCM engine fuel supply line (the big one). It will require the plastic tool to disengage the fitting's retaining clips. Get a piece of 3/8" fuel line and put it on the HPCM fitting with a clamp. Get a container to catch the fuel. Turn on the HPCM and you should have a lot of fuel flowing into the container. If not, continue on. Reconnect the engine fuel supply line.
Remove the fuel tank supply line to the HPCM. Not sure about this next step. I believe there is a screen in the supply line to keep the big chunks out of the HPCM. Not sure if the tank fuel goes directly to the pump or through the filter then the pump. Get an inspection mirror and check to make sure the screen is not clogged.
If your HPCM is working OK and the screen is clear, then you have a restriction in your fuel supply line. I believe there is a sock attached to the fuel supply stand pipe in the fuel tank. That sock could be clogged and restricting fuel flow to the HPCM.
Try this. Remove the fuel tank supply line (3/8" line) from the HPCM. Just squeeze the connector and it slides right off. Remove the fuel filler cap. Get an air hose and SLOWLY pressurize the fuel supply line at the HPCM until you hear rumblings in the fuel tank. Once you hear rumblings give it a couple of good shots of air. Connect it back to the HPCM and see if your problem goes away.
If this fixes the problem, then you need to drop your fuel tank eventually and clean it.
DSMMH
It sounds like a typical gasoline fuel pump failure. Pumps sufficient fuel at idle but will not supply enough fuel at higher RPMs.
Remove the HPCM engine fuel supply line (the big one). It will require the plastic tool to disengage the fitting's retaining clips. Get a piece of 3/8" fuel line and put it on the HPCM fitting with a clamp. Get a container to catch the fuel. Turn on the HPCM and you should have a lot of fuel flowing into the container. If not, continue on. Reconnect the engine fuel supply line.
Remove the fuel tank supply line to the HPCM. Not sure about this next step. I believe there is a screen in the supply line to keep the big chunks out of the HPCM. Not sure if the tank fuel goes directly to the pump or through the filter then the pump. Get an inspection mirror and check to make sure the screen is not clogged.
If your HPCM is working OK and the screen is clear, then you have a restriction in your fuel supply line. I believe there is a sock attached to the fuel supply stand pipe in the fuel tank. That sock could be clogged and restricting fuel flow to the HPCM.
Try this. Remove the fuel tank supply line (3/8" line) from the HPCM. Just squeeze the connector and it slides right off. Remove the fuel filler cap. Get an air hose and SLOWLY pressurize the fuel supply line at the HPCM until you hear rumblings in the fuel tank. Once you hear rumblings give it a couple of good shots of air. Connect it back to the HPCM and see if your problem goes away.
If this fixes the problem, then you need to drop your fuel tank eventually and clean it.
DSMMH
Thread Starter
|
Freshman User
Joined: Mar 2010
Posts: 46
Likes: 0
Ok, I did everything you said, and also took apart the HFCM and cleaned it out real good. It had a lot of crap in it. I put it all back together and it is still doing the same thing. I have a pump on order, so I guess that will be my next step. Is there anything else I can check in the interim?
