12 V swap - Bad lift pump/primer??
#1
12 V swap - Bad lift pump/primer??
So my donor '95 Dodge ran fine for the 2-3 wks I drove it before I removed the motor. It's basically installed in my '78 Ford Crewcab.
I did nothing to the fuel system except remove the rubber lines where they attach to the supply & return lines up near the head.
The motor started on the first try the other day. I then ran out of fuel , reprimed it by bleeding at the injectors and using the primer button. Took it for a couple short drives and it acted like it was running out of fuel. So I replace the supply line with hard lines and short sections of pushlock fuel line & fittings.
Now I can't get it to start. I think the primer is faulty. I even took off the hose that connects between the heater and the pump and installed a long length of hose from the pump to a canister of diesel. The primer bulb has basically ZERO resistance and I can tell it's bringing some fuel up cause if I take the line out of the can I see just a little draining back.
Now the primer is leaking. I heard there's an o-ring in there? Sounds like I should replace it?
I did nothing to the fuel system except remove the rubber lines where they attach to the supply & return lines up near the head.
The motor started on the first try the other day. I then ran out of fuel , reprimed it by bleeding at the injectors and using the primer button. Took it for a couple short drives and it acted like it was running out of fuel. So I replace the supply line with hard lines and short sections of pushlock fuel line & fittings.
Now I can't get it to start. I think the primer is faulty. I even took off the hose that connects between the heater and the pump and installed a long length of hose from the pump to a canister of diesel. The primer bulb has basically ZERO resistance and I can tell it's bringing some fuel up cause if I take the line out of the can I see just a little draining back.
Now the primer is leaking. I heard there's an o-ring in there? Sounds like I should replace it?
#3
At least 40 ish times. When I was having issues with starting the last few days I'd push the primer 30-40 times and I'd start to hear a faint "hissing" and fuel returning to the tank. After that it would start after a couple of attempts.
But now I can't even pull fuel out of a can and I have fuel leaking from the primer.
#4
Yeah it's definitely an issue with the primer. I'm not sure if it's supposed to but I'm pretty sure the fuel shouldn't be flowing back either. Could that be a sign of a bad overflow valve? I'm pretty sure that's one of the symptoms of it being bad, which would add to the no start issue you're having.
#5
I had a similar issue with my Kubota this last week. Over the course of the 8 months it sat I played with the primer at some point and had the same issue it sounds like you. I really thought it was the primer so I took it off and cleaned it up and inspected it... it seemed fine.
I ended up gravity feeding off a small tank directly to the IP and had it running. I then did the same thing through the lift pump... and double checked the primer was working. I also installed an electric pump about 2ft off the tank and primed the entire system with that last. Then checked the primer and it had pressure. Works great now.
I dont use the electric pump, it is a pass through and is there just in case I ever need it again. Heres the pump I used in case you want to try it. (its got 5/16 barbs not 3/8 like it says)
I ended up gravity feeding off a small tank directly to the IP and had it running. I then did the same thing through the lift pump... and double checked the primer was working. I also installed an electric pump about 2ft off the tank and primed the entire system with that last. Then checked the primer and it had pressure. Works great now.
I dont use the electric pump, it is a pass through and is there just in case I ever need it again. Heres the pump I used in case you want to try it. (its got 5/16 barbs not 3/8 like it says)
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