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Old 01-14-2020, 02:00 AM #1
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Fuel pump check valve?

Hi everyone, I recently upgraded from a 3rd gen and I think I知 having some fuel pressure problems. I suspect it痴 the check valve at the fuel pump. Does anyone know if the check valve is part of the pump itself or if it痴 part of the complete fuel pump assembly? I知 hoping to have parts on hand before attempting the fix but I知 not sure what part I need.

Thanks for any help or advice
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Old 01-14-2020, 10:16 PM #2
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theres a check valve in the pump when I pulled mine to upgrade but there is an o-ring that seals the pump against the plastic housing. It's possible that either the pump is bad, the o-ring is bad or the housing is cracked. If you find that its cracked you can always bypass the plastic housing and go directly to the port at the top with submersible safe fuel hose. some modification is required though.
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Old 11-19-2021, 08:23 AM #3
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I think the problem comes from your sump pump check valve. I had a similar issue, and at first, I didn’t understand where the issue came from. I asked my friend to come over and check it since he is a professional, and he directly said that I should change my check valve. He said that I should check a website sumppumpadvisor.com that has reviews on the best sump pump check valve. I went through the wit and chose the best option for myself. I ended up changing my sump pump check valve, and everything has worked well since then.

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Old 11-19-2021, 09:15 AM #4
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There is a fuel pressure damper on the fuel rail passenger rear side. Thats most likely the faulty part on the pressure side.
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Old 11-19-2021, 08:17 PM #5
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What are the symptoms that led you to believe that you have fuel pressure issues? No start issues, stalling, power loss, etc
The T4R is more difficult to diagnose fuel pressure issues as there is no pressure test port on the fuel rail; as there are in many vehicles. Without it then you are guessing. The cheapest speculation would be to replace the pressure regulator. If that does not solve it then I would personally replace the fuel pump. There is a pulsation dampener but that thing is confusing to me. Why is this needed if the pressure regulator is functioning correctly?
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