Fuel Check Valve Question
Thread Starter
Junior Member
Joined: Jan 2017
Posts: 23
Likes: 3
From: Columbus, Ohio
Fuel Check Valve Question
So I just purchased another 79 RX-7. The car was modified back in probably the early 80's with a Mikuni 44 and a full RB exhaust (Yes, the old school one). The car was running fine at idle and light throttle but when I tried high throttle and high RPM acceleration it just fell on it's face. I put on a fuel pressure gauge and it read 3psi. My understanding is that aftermarket carbs need around 4.5psi. I swapped in a new 6psi pump and added a fuel pressure regulator. I was seeing 4.5 to 5psi for a bit and then it just took a nosedive.
I noticed that the fuel still goes through the check valve after the pump. Can the check valve cause this? Should I bypass it or should I try to replace it?
Thanks for the help!
I noticed that the fuel still goes through the check valve after the pump. Can the check valve cause this? Should I bypass it or should I try to replace it?
Thanks for the help!
Thread Starter
Junior Member
Joined: Jan 2017
Posts: 23
Likes: 3
From: Columbus, Ohio
That was actually the first thing I did. Started better but still doesn't drive very well when pushed. The car has started smoking more too, so I'm starting to think a rebuild is in order.
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