Fuel Pressure Decay
04-30-08, 01:06 AM
#1
"Mellow Yellow"
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Fuel Pressure Decay
How much decay over what period of time is considered normal?
My motor was rebuilt. I changed the secondary fuel rail, added 1680's and a FPR. The rx7store kit. Primary injectors were not touched, merely removed and then reinstalled.
Once pressurized to 38psi, it takes 4 minutes and 38 seconds on average to return to 0. There are no external fuel leaks to be found.
The first test was using the stock pump. I switched it out for my Denso SupraTT pump, all the while checking to make sure that the O ring was seated correctly. It had no effect. (Off topic: Part number 13590-1270 is also the supra pump, as I could only find 13590-1020 listed?)
Am I going to have to take the primaries out again, to get them cleaned, as a most likely culprit?
My motor was rebuilt. I changed the secondary fuel rail, added 1680's and a FPR. The rx7store kit. Primary injectors were not touched, merely removed and then reinstalled.
Once pressurized to 38psi, it takes 4 minutes and 38 seconds on average to return to 0. There are no external fuel leaks to be found.
The first test was using the stock pump. I switched it out for my Denso SupraTT pump, all the while checking to make sure that the O ring was seated correctly. It had no effect. (Off topic: Part number 13590-1270 is also the supra pump, as I could only find 13590-1020 listed?)
Am I going to have to take the primaries out again, to get them cleaned, as a most likely culprit?
04-30-08, 10:03 AM
#3
Tequila? ..it's like beer
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It's fine. Most aftermarket FPRs are not designed to hold fuel pressure after shutdown. It's an emissions requirement for OEMs but not for performance parts.
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