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No start in LA II

2K views 11 replies 5 participants last post by  99c5ls1 
#1 ·
Fuel Pump no start

First time post, 23 year Corvette owner/daily driver. Second LT-1, '94 6 speed Polo Green 68k miles. See if this makes sense. Car died on the way to work Friday, cranked but would not start. Got it home and attached fuel pressure gauge held steady 40+ psi, pulled the codes via paper clip, and only got a front right O2 sensor (64?), had O2 problem with my first LT1 auto, so got all three and changed them Saturday, car started and ran although it had rough idle. Got in it Sunday AM and again it cranked, but no start. Put the guage back on, and zero fuel pressure. Checked at connection above fuel tank to pump, and was pullin 12.32 volts off middle wire. Appears to be an intermittent issue with pump, and replacement should correct problem. Changed one on my'85, so I'm familiar with the job. This sound reasonable, or could it be something else, the fact it's showing twleve volts at pump lead me to believe the relay is good and pump is bad. Thanks!
 
Discussion starter · #3 ·
Thanks for reply, however I changed pump, and now again have 40+ psi at the guage, when I first cranked it sounded great for couple of minutes, revved nicely and all, about the time I got out to check for leaks at the tank it died. Still have excellent pressure at the rail, and it tries to start, but won't. Checked vacum hoses, electrical connections, etc...
 
Discussion starter · #4 ·
Here's my issue, car died on the way to work Friday, towed it home and attached fuel pressure gauge, it held a steady 40+ psi, paperclipped the codes, and got a front right O2 sensor (64?), had O2 problem with my first LT1, so replaced all three, car started and ran although it had rough idle, next day it turned over but wouldn't start. Put the guage back on, had zero fuel pressure, replaced pump last night, car started and ran great for about two minutes, and then stumbled and died, still have 40+psi at fuel rail, car tries to start but won't. Maven suggested in earlier post a possible amp problem, I did have a lot of battery crud around the battery and one of the maxi fuses block, cleaned it well, systems off that fuse block seem fine, is there a relay in that vacinity that could be affected by the battery sludge? Put a guage per FSM and checked spark at a couple of plugs and both showed fire. Hope it's not my opti spark, I'd just replaced all that on my other 94 before selling it. This one has 68k miles and is setting no codes. I've been working on my own Corvettes over 20 years, nice to receive help from others that have been there, and look forward to returning the favor.
 
Discussion starter · #5 ·
After going through everything else, went back to basics, fire, fuel and air, took air induction hose off and spayed a small quantity of starter fluid in, and car started and ran for a couple of seconds, it's not optispark, or fuel pump it must be something not allowing injectors to function properly, any ideas?
 
Discussion starter · #6 · (Edited)
Follow up

Got it started, but idles rough, and exhausts smells strong, like bad gas, but called Chevron, and they claim no one has reported any problems. It's similar to bad O2 sensor, but I've replaced all three and have no MIL. Unplugged MAF and TPS to verify MIL functions, and it did. Now I'm wondering about optispark again. Sorry, car is 94 lt1 6 speed all stock.
 
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