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1,652 Posts
I am having a strange problem with my fuel pressure and before I blame the FPR, I want to make sure I do not have other problems.
I set the pressure to 45# (vac off for a Thrasher)and with the vac on it holds steady at 38# at idle and cracking the throttle. After driving for a while, the pressure drops to 38# with the VAC OFF! Once it drops, it holds steady. If I readjust it back to 45#, looks good at idle, but after driving, it jumps to 52# with vac off. Definite pattern of + or - 7# of the desired pressure. I intend to try a stocker to see what happens.
My question to the board has to do with an RCI aluminum fuel cell I just installed. The cell has a -8 feed in the rear sump, a -6 return on top of the cell and a vent with a rollover valve on top. It has no foam. I can hear the fuel dripping from the return and can smell the fumes as it is currently vented to the atmosphere. Is there any possibility the pressure problem could be because of the cell? I have heard that aluminum tanks, because they flex, can act like a lung. However, if the vent is functional, I have a hard time seeing how it might be the culprit.
Any input or suggested tests would be appreciated.
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Scottie's GNZ
I set the pressure to 45# (vac off for a Thrasher)and with the vac on it holds steady at 38# at idle and cracking the throttle. After driving for a while, the pressure drops to 38# with the VAC OFF! Once it drops, it holds steady. If I readjust it back to 45#, looks good at idle, but after driving, it jumps to 52# with vac off. Definite pattern of + or - 7# of the desired pressure. I intend to try a stocker to see what happens.
My question to the board has to do with an RCI aluminum fuel cell I just installed. The cell has a -8 feed in the rear sump, a -6 return on top of the cell and a vent with a rollover valve on top. It has no foam. I can hear the fuel dripping from the return and can smell the fumes as it is currently vented to the atmosphere. Is there any possibility the pressure problem could be because of the cell? I have heard that aluminum tanks, because they flex, can act like a lung. However, if the vent is functional, I have a hard time seeing how it might be the culprit.
Any input or suggested tests would be appreciated.
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Scottie's GNZ