Rear Fuel Pump Problems
Cross-Country
Joined: Aug 2023
Posts: 77
Likes: 18
From: CA
Apologies, wasn't trying to. I had started one and received no responses, but that was probably due to so many other previous people posting about crossflow issues. I know that crossflow was common because I had done research and read other people's postings. Just had not ran across my issue before in previous threads.
Hotshot
Joined: Jul 2020
Posts: 10,411
Likes: 2,612
From: Near Salt Lake City
If I'm not mistaken the inline check valve is for a separate problem and they go on the pressure line, I don't think a faulty shuttle valve on the return side will be corrected with one of these. Correct me if I'm wrong but I think they solve a different problem than the return shuttle failure.
There are 2 one way valves in the pump assembly, both on the supply side
The recall valves are to fix fuel returning to the wrong tank
Cargo Master
Joined: Mar 2007
Posts: 2,813
Likes: 1,024
There are two ways fuel can return to the wrong tank. One is the check valve in the high pressure fuel line and the other is the shuttle valve in the fuel pump assembly. From my understanding, not all of the fuel pump assemblies have this shuttle valve. I know my 95 F250 does. It's possible that the early models have the fuel tank selector valve and those system are a bit different.
This is an ongoing issue and there are several threads about this same topic. I'm not certain why it is so confusing. Fuel will go back into the wrong tank by either the fuel pressure line or the fuel return line. If the fuel is going back on the pressure line then it's the check valve in the line. If it is going back on the return line, then it's the shuttle valve or the fuel selector valve. I suspect all of those parts fail and until you know what is failing in your truck, you will never know. I suspect every solution is right, but not every solution is right for you.
This is an ongoing issue and there are several threads about this same topic. I'm not certain why it is so confusing. Fuel will go back into the wrong tank by either the fuel pressure line or the fuel return line. If the fuel is going back on the pressure line then it's the check valve in the line. If it is going back on the return line, then it's the shuttle valve or the fuel selector valve. I suspect all of those parts fail and until you know what is failing in your truck, you will never know. I suspect every solution is right, but not every solution is right for you.
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