Fuel rail pressure bleed down
#1
Fuel rail pressure bleed down
I'm trying to figure out why I need to crank the engine over for about 5 seconds before the truck finally starts. I hooked up a pressure gauge to the fuel rail and it showed 0psi. Turned the key to run and it shot up to about 35 on both tanks. Started it up for a few mins then shut it down. Pressure returned to 0 in about 5-10 seconds.
Is this an issue or normal operation?
Is this an issue or normal operation?
#4
#5
Hi, I have a question plz tell me how to bleed air from my 1987 ford bronco full size!???
#7
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#9
#10
I have checked for fuel leaking out of a hose and can't seem to see any. I do run it low on gas often simply because it uses the cap out of gas. There is definitely air in the lines though and I have no idea as to how to get it out.
#11
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The fuel system on this truck is a bit more complicated with the frame mounted resovoir/switching valve and also the dual stage fuel pumps. I suspect either you have a dead in-tank pump or there is something wrong with the "switching valve" which is officially known as a single function resovoir or dual function resovoir depending if the truck has 1 or 2 tanks.
Normally if both pumps are working then this system moves a lot more fuel than the engine can use so most of the time it's just dumped right back in the tank and there is simply no way air can get in the lines.
Normally if both pumps are working then this system moves a lot more fuel than the engine can use so most of the time it's just dumped right back in the tank and there is simply no way air can get in the lines.
#12
The fuel system on this truck is a bit more complicated with the frame mounted resovoir/switching valve and also the dual stage fuel pumps. I suspect either you have a dead in-tank pump or there is something wrong with the "switching valve" which is officially known as a single function resovoir or dual function resovoir depending if the truck has 1 or 2 tanks.
Normally if both pumps are working then this system moves a lot more fuel than the engine can use so most of the time it's just dumped right back in the tank and there is simply no way air can get in the lines.
Normally if both pumps are working then this system moves a lot more fuel than the engine can use so most of the time it's just dumped right back in the tank and there is simply no way air can get in the lines.
Last edited by lana-phillip; 05-15-2016 at 04:21 AM. Reason: add in
#13
You have no switching valve on a 1987 ford Bronco full size with one tank and with EFI and a 302 motor.
But you should have a fuel reservoir mounted on the frame. It could be broken or missing the big "O" ring for the cup.
OR a bad fuel line connection to the between the high pressure pump and the single tank Reservoir.
The single tank Reservoir:
/
But you should have a fuel reservoir mounted on the frame. It could be broken or missing the big "O" ring for the cup.
OR a bad fuel line connection to the between the high pressure pump and the single tank Reservoir.
The single tank Reservoir:
/
#14
You have no switching valve on a 1987 ford Bronco full size with one tank and with EFI and a 302 motor.
But you should have a fuel reservoir mounted on the frame. It could be broken or missing the big "O" ring for the cup.
OR a bad fuel line connection to the between the high pressure pump and the single tank Reservoir.
The single tank Reservoir:
/
But you should have a fuel reservoir mounted on the frame. It could be broken or missing the big "O" ring for the cup.
OR a bad fuel line connection to the between the high pressure pump and the single tank Reservoir.
The single tank Reservoir:
/
#15
Also, aside from when I purge it and air coming out, when we are driving it and have to give it gas to go up a hill for instance it cuts in and out. It's gotten to where it even does it by just pressing the gas period unlike at first it only happened when we had to really press the gas. Also I told y'all wrong I thought we had changed the pump in the tank but we actually didn't because when we pulled it out and checked it, it was working. Is it possible for a pump to stop working properly on and off???