Hpop priming? Troubleshooting help!
Thread Starter
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Freshman User
Joined: Mar 2020
Posts: 33
Likes: 0
From: Downriver Area - Michigan
Oil pumps whine when they are starving for oil. How much fuel is in the tank? Pull the hose off the back end of the pump and see if you can get fuel to come out that line. Alternatively, you can attach a hose to the back of the pump and put it into a bucket of fuel and see if it flows then.
Or fuel pumps whine when they are starved?
I'm gonna go with fuel pump.
Tomorrow I will disconnect the pump and test the flow.
If the pump is good. I'll trace back the line to the tank.
Tank reads at 1/4 tank.
I try not to go below that amount. And the gauge hasn't failed me yet but I could hit on the tank and see if it sounds empty.
I really dont think the tank is empty. I usually get decent milage and as soon as I go below a quarter tank I fill it up. If it was running the first stop would be the station.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Any idea if the Hutch mod has been done? These trucks are notorious for in tank fuel problems. the pick up foot can basically dissolve and leave you sucking air at a quarter tank. There are a couple different versions in the tech section at the top of this forum, or here.
https://www.ford-trucks.com/forums/1...-7-3l-psd.html
https://www.ford-trucks.com/forums/1...-7-3l-psd.html
Logistics Pro
Joined: May 2017
Posts: 4,667
Likes: 1,455
From: Muskogee, Ok
Add fuel to above the ¼ mark and try again. However....
If the pump doesn't come on normally I have a thought. You said your troubles started when you shoved thru that snow plow berm at the end of your driveway and it went into limp mode. What if you actually set off the fuel cut off bump switch on the passenger kick panel, and the limp mode you observed was from no fuel pressure, these things will continue to run with no pressure, barely, ask me how I know....
If the pump doesn't come on normally I have a thought. You said your troubles started when you shoved thru that snow plow berm at the end of your driveway and it went into limp mode. What if you actually set off the fuel cut off bump switch on the passenger kick panel, and the limp mode you observed was from no fuel pressure, these things will continue to run with no pressure, barely, ask me how I know....
Thread Starter
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Freshman User
Joined: Mar 2020
Posts: 33
Likes: 0
From: Downriver Area - Michigan
Add fuel to above the ¼ mark and try again. However....
If the pump doesn't come on normally I have a thought. You said your troubles started when you shoved thru that snow plow berm at the end of your driveway and it went into limp mode. What if you actually set off the fuel cut off bump switch on the passenger kick panel, and the limp mode you observed was from no fuel pressure, these things will continue to run with no pressure, barely, ask me how I know....
If the pump doesn't come on normally I have a thought. You said your troubles started when you shoved thru that snow plow berm at the end of your driveway and it went into limp mode. What if you actually set off the fuel cut off bump switch on the passenger kick panel, and the limp mode you observed was from no fuel pressure, these things will continue to run with no pressure, barely, ask me how I know....
I will give it a look in the morning. I appreciate the feedback.
Banned
Joined: Dec 2018
Posts: 3,541
Likes: 458
I can say from experience the engine will start and idle with no fuel pump pressure. Give it any throttle and it will stumble and die. You could call this "limp mode" I guess. As long as the pump is grounded you can run a 12V lead off the battery down to the pump. If it runs the pump fine it ain't the pump that's the problem but rather the circuit feeding it.
Cargo Master
Joined: Mar 2019
Posts: 2,907
Likes: 788
From: Kinnula,Finland
I have a broken pickup in my tank and i can hear changes in the pump and fuel pressure starts fluctuating around 1/4 tank.
1/8 tank the struggling starts.
Put the pump suck from bucket and after that the power circuit needs to be resolved.
Father Of Five From Finland
(new user name for me..?)
1/8 tank the struggling starts.
Put the pump suck from bucket and after that the power circuit needs to be resolved.
Father Of Five From Finland
(new user name for me..?)
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
Oil pumps whine when they are starved?
Or fuel pumps whine when they are starved?
I'm gonna go with fuel pump.
Tomorrow I will disconnect the pump and test the flow.
If the pump is good. I'll trace back the line to the tank.
Tank reads at 1/4 tank.
I try not to go below that amount. And the gauge hasn't failed me yet but I could hit on the tank and see if it sounds empty.
I really dont think the tank is empty. I usually get decent milage and as soon as I go below a quarter tank I fill it up. If it was running the first stop would be the station.
Or fuel pumps whine when they are starved?
I'm gonna go with fuel pump.
Tomorrow I will disconnect the pump and test the flow.
If the pump is good. I'll trace back the line to the tank.
Tank reads at 1/4 tank.
I try not to go below that amount. And the gauge hasn't failed me yet but I could hit on the tank and see if it sounds empty.
I really dont think the tank is empty. I usually get decent milage and as soon as I go below a quarter tank I fill it up. If it was running the first stop would be the station.
Thread Starter
|
Freshman User
Joined: Mar 2020
Posts: 33
Likes: 0
From: Downriver Area - Michigan
Ok I ended putting fuel in the tank. She is at a half tank now. She still did not start.
I then removed the fuel pump to flow test it.
While taking off the lines I had fuel leak out of the line going to the motor.
But not a single drop coming from the line from the tank.
I then removed the fuel pump to flow test it.
While taking off the lines I had fuel leak out of the line going to the motor.
But not a single drop coming from the line from the tank.
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Thread Starter
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Freshman User
Joined: Mar 2020
Posts: 33
Likes: 0
From: Downriver Area - Michigan
Ok I ended putting fuel in the tank. She is at a half tank now. She still did not start.
I then removed the fuel pump to flow test it.
While taking off the lines I had fuel leak out of the line going to the motor.
But not a single drop coming from the line from the tank.
I then removed the fuel pump to flow test it.
While taking off the lines I had fuel leak out of the line going to the motor.
But not a single drop coming from the line from the tank.
I flow tested the pump.
It spit and sputtered a little bit. Some cloudy stuff came out , but it ended up working fine.
I also ended up using the air compressor and pressurized the fuel inlet side of the fuel tank and it took a second but it burped and got fuel out of it too.
Only other thing to note.
When I took the pump off the inlet line from the tank the plastic white snap washer or whatever it was, was broken.
Would this let air in and cause a no start too?
And is this available locally? Or should I do the inline filter mod and get rid of it?
Or regular line.
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
Hutch and Harpoon mods are very beneficial and sound just like what you need. May have screens in the tank clogging.
If you don't have time right now you can get fuel hose rated for diesel, can't remember the correct number right now, and a hose barb coupler. Cut off a short section including the quick disconnect at the pump and splice short section in it's place. do the h an h mods as soon as you can.
Edit: Had a minute to look it up, 30R7 is diesel rated and good up to 50 psi so works fine from tank to pump. 30R9 is diesel rated but up to 180 psi.
Edit: this and a couple of fuel injection style hose clamps
https://shop.advanceautoparts.com/p/...E&gclsrc=aw.ds
If you don't have time right now you can get fuel hose rated for diesel, can't remember the correct number right now, and a hose barb coupler. Cut off a short section including the quick disconnect at the pump and splice short section in it's place. do the h an h mods as soon as you can.
Edit: Had a minute to look it up, 30R7 is diesel rated and good up to 50 psi so works fine from tank to pump. 30R9 is diesel rated but up to 180 psi.
Edit: this and a couple of fuel injection style hose clamps
https://shop.advanceautoparts.com/p/...E&gclsrc=aw.ds
Thread Starter
|
Freshman User
Joined: Mar 2020
Posts: 33
Likes: 0
From: Downriver Area - Michigan
Hutch and Harpoon mods are very beneficial and sound just like what you need. May have screens in the tank clogging.
If you don't have time right now you can get fuel hose rated for diesel, can't remember the correct number right now, and a hose barb coupler. Cut off a short section including the quick disconnect at the pump and splice short section in it's place. do the h an h mods as soon as you can.
If you don't have time right now you can get fuel hose rated for diesel, can't remember the correct number right now, and a hose barb coupler. Cut off a short section including the quick disconnect at the pump and splice short section in it's place. do the h an h mods as soon as you can.
appreciate it
this is what I've been told I need
Parts List: - 3/8” compression union
- 8-10” of 3/8” tubing
- 12” of 5/16” 30R9 fuel hose
- (4) fuel injection hose clamps
- WIX 33972 fuel filter
off of
https://www.ford-trucks.com/forums/1...l#post19216921
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
appreciate it
this is what I've been told I need
Parts List: - 3/8” compression union
- 8-10” of 3/8” tubing
- 12” of 5/16” 30R9 fuel hose
- (4) fuel injection hose clamps
- WIX 33972 fuel filter
off of
https://www.ford-trucks.com/forums/1...l#post19216921
this is what I've been told I need
Parts List: - 3/8” compression union
- 8-10” of 3/8” tubing
- 12” of 5/16” 30R9 fuel hose
- (4) fuel injection hose clamps
- WIX 33972 fuel filter
off of
https://www.ford-trucks.com/forums/1...l#post19216921
Edit: My memory isn't what it used to be but IIRC there is a quick disconnect on the tank end of the line as well. Personally I would want to eliminate that connection as well and would put new fuel line on it.
Lead Driver
Joined: Jun 2013
Posts: 5,647
Likes: 891
From: north of Minneapolis, MN
When you do the Hutch mod, you will find some screens in the mixing chamber. I'll be interested in two things. 1) if the pick-up foot has fallen off. and 2) if the mixing chamber screens are clogged.
