still wont bleed
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
Are you getting clear fuel out of the schrader valve or a lot of air with it. No clue on the hissing but if you keep getting air at the schrader valve you are sucking air somewhere before the lift pump.
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
Your lift pump is not working or your line is blocked somewhere or your tank is empty.
Try blowing back through your fuel line and have someone listen at the fuel tank filler and see if they can hear the fuel bubling, or remove the line from the fuel pump and blow on the tank until you have fuel running out of the line by the pump.
Try blowing back through your fuel line and have someone listen at the fuel tank filler and see if they can hear the fuel bubling, or remove the line from the fuel pump and blow on the tank until you have fuel running out of the line by the pump.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
If you got neither air or fuel at the schrader valve, something is wrong with the lift pump or the filter is completely clogged or the line from the lift pump to the filter is crimped off.
Even if the fuel line was disconnected at the tank, you would still get air.
Even if the fuel line was disconnected at the tank, you would still get air.
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Post Fiend
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From: concord ca
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Methanoholic
Joined: Mar 2009
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From: Maine (NorCal Native)
The lift pump will pump something if it's working, Air or Fuel! Unless the suction or pressure side is completely blocked.
You state there is no air or fuel coming out of the Schrader valve, This leads me to believe you didn't get the lift pump installed correctly.
Of course there is the possibility you got a bad lift pump.
You can test it by unhooking the suction side at the pump.
Then you could do one or more of the following.
1. Hook a temp line to the suction side into a clean bucket (pepsi bottle) of fuel, crank the motor.
2. Put your finger over the suction side and feel for suction when cranking.
-Enjoy
fh : )_~
You state there is no air or fuel coming out of the Schrader valve, This leads me to believe you didn't get the lift pump installed correctly.
Of course there is the possibility you got a bad lift pump.
You can test it by unhooking the suction side at the pump.
Then you could do one or more of the following.
1. Hook a temp line to the suction side into a clean bucket (pepsi bottle) of fuel, crank the motor.
2. Put your finger over the suction side and feel for suction when cranking.
-Enjoy
fh : )_~
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
With a new lift pump incorrect install gets my vote. What happened that caused you to change it.Asking because I don't know how many times I have seen people change a fuel pump because they were out of fuel or other problem.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
That puts me to incorrect install or defective pump right out of the box.
The lift pump is positive displacement, so it will pump either air or fuel when the engine is turning over.
A solid pluged line on one side or the other of the pump is the only other option.
The lift pump is positive displacement, so it will pump either air or fuel when the engine is turning over.
A solid pluged line on one side or the other of the pump is the only other option.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Even if the IP was off the engine, you should still get fuel at the filter when you are cranking the engine over.
So your problem is at the lift pump or before the filter.
As said before, even if you chop the line in two, the lift pump will still pump air.
Si either the supply line is blocked solid, the feed line to the filter is blocked solid, all pressure is escaping between the lift pump and filter or the lift pump is bad.
If the original pump was doing the same thing, I think you need to look at fuel lines.
Do you have any way to blow through the suction line with compressed air cut down to 20 PSI or so?
If you do, remove the fuel cap on the correct tank and blow through the line.
Just off the top of my head, wonder if something is stuck in the fuel selector valve port blocking the line?
How full was the tank when you changed the lift pump?
Did you have any fuel running out of the supply line?
Any chance you crimped the rubber line to stop the fuel flow and forgot to remove the vice grips?
So your problem is at the lift pump or before the filter.
As said before, even if you chop the line in two, the lift pump will still pump air.
Si either the supply line is blocked solid, the feed line to the filter is blocked solid, all pressure is escaping between the lift pump and filter or the lift pump is bad.
If the original pump was doing the same thing, I think you need to look at fuel lines.
Do you have any way to blow through the suction line with compressed air cut down to 20 PSI or so?
If you do, remove the fuel cap on the correct tank and blow through the line.
Just off the top of my head, wonder if something is stuck in the fuel selector valve port blocking the line?
How full was the tank when you changed the lift pump?
Did you have any fuel running out of the supply line?
Any chance you crimped the rubber line to stop the fuel flow and forgot to remove the vice grips?
