Fuel pump not pumping fuel
#1
Join Date: Nov 2005
Location: Charles Town, W bygod Va
Posts: 7,437
Likes: 0
Received 3 Likes
on
3 Posts
Fuel pump not pumping fuel
01 7.3. Cranks, won't start. Tank was at 1/4 but is full now. The lift pump runs, I can feel and hear that the motor is spinning when I cycle the key. I removed the fuel filter and cycled the key and get no fuel into the bowl. It looks like the lines are stainless from the pump to the tank so I doubt it is sucking air. I pressurized the tank with a shop vac and I get fuel coming into the filter housing. Am I missing something obvious? I have never seen an electric pump that would run and not pump fuel. I removed the suction line at the pump and don't feel any suction there.
#2
01 7.3. Cranks, won't start. Tank was at 1/4 but is full now. The lift pump runs, I can feel and hear that the motor is spinning when I cycle the key. I removed the fuel filter and cycled the key and get no fuel into the bowl. It looks like the lines are stainless from the pump to the tank so I doubt it is sucking air. I pressurized the tank with a shop vac and I get fuel coming into the filter housing. Am I missing something obvious? I have never seen an electric pump that would run and not pump fuel. I removed the suction line at the pump and don't feel any suction there.
If so (it does lift and supply 50 psig), then, there is most probably a blockage in the mixing chamber in the pickup unit in the tank. If this is the case, do the Hutch Mod to correct.
#7
No, it's a whole design problem.
- There is a mixing chamber in the tank. Once air gets in the fuel, the foam returns to the mixing chamber and is fed to the fuel pump inlet.
- There are screens in the tank to pre-screen the pump. Not exactly an easily serviceable item.
- The quick-disconnects on the supply line at the tank and the pump have O-ring seals. O-rings suck at suction sealing.
Trending Topics
#8
Below are two links concerning the hutch mod. One is from Guzzles page and the other is my experiences with the hutch mod. Between the two you should have enough information and images to figure out your next step. Keep the questions coming if you have them.
Welcome to guzzle's In-tank Hutch Mod Web Page
https://www.ford-trucks.com/forums/1...ne-almost.html
If it were me though, I would get a fuel can and use that to figure out if the pump is working correctly or not. This will either rule out the pump as the faulty part, or the screens/sending unit as the faulty part in just a few moments and without dropping the tank.
Welcome to guzzle's In-tank Hutch Mod Web Page
https://www.ford-trucks.com/forums/1...ne-almost.html
If it were me though, I would get a fuel can and use that to figure out if the pump is working correctly or not. This will either rule out the pump as the faulty part, or the screens/sending unit as the faulty part in just a few moments and without dropping the tank.
#9
Join Date: Nov 2005
Location: Charles Town, W bygod Va
Posts: 7,437
Likes: 0
Received 3 Likes
on
3 Posts
I'm starting to think it is a restriction in the tank. When I pressurized the tank the only fuel I saw coming into the filter was through the orfice at the top, which I believe is the return. The truck is an hour away and no real rush to get it running so I'm not sure when I will mess with it. Too bad we filled the tank all the way.
#11
#14
Take the line off the pump and shoot a little shop air back to the tank, usually will blow some crud off the mixing chamber screens and free up some flow if that is your problem. I can think of 4 trucks I've done this to on the side of the road to get it to limp on home. You need to get rid of that crap in the tank anyway, it's a joke.
#15
I've even had this work on my Excursion after doing the Hutch/Harpoon mod. I forgot to re-install the plastic screen in my pickup foot , and some junk evidently got sucked up into the pickup tube and was plugging at the bend on top of the tank ...Once pressurized, I could hear when it cleared and the air started gurgling loudly in the tank... VERY noticeable performance increase, and the pump cavitation noise went completely away.
Now it's coming back again, so I must drop and clean the tank all over again, and this time I'm going to replace the pickup foot with a new one.