I have an '89 Iroc L98. It has 60k miles on it. I went to check the fuel pressure and primed the rails by turning the key on and off with the fuel pressure guage connected. It initially read 46psi but after about a minute it dropped 2psi and 5 minutes it read 40psi. It will probably be at zero in about 20minutes. I have checked the AFPR and it has no leaks, no leaks on new fuel guage eighter. I have heard that the TPI fuel rails should hold pressure for like 10hours. What could be wrong?
Thanks!!
Thanks!!
Senior Member
IROCKZ4me
Senior Member
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Sep 11, 2006
That isn't entirely uncommon.
If you have no external leaks, then it is bleading of through a/some leaky injector/s or back through the fuel pump. If it doesn't black smoke out of the exhaust when you fire it up after it has been setting a while (bleeding pressure) then it is likely leaking back through the pump. Not a big deal unless it gets excessive.
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Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"
If you have no external leaks, then it is bleading of through a/some leaky injector/s or back through the fuel pump. If it doesn't black smoke out of the exhaust when you fire it up after it has been setting a while (bleeding pressure) then it is likely leaking back through the pump. Not a big deal unless it gets excessive.
------------------
Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"
- 355 cid
- AFR heads
- Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
- modified SLP runners
- TRW forged pistons/ceramic coated
- fully balanced
- Edelbrock headers/ceramic coated
- SLP cat-back
- Paxton supercharger
- Nitrous Express nitrous oxide