new fuel pump failure???
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
new fuel pump failure???
installed new pump -from NAPA, ran for maybe 15 minutes, and died in the driveway....no pressure....put 12 volts to terminal G on the aldl, no pressure. I can hear the click of the relay when I turn the key, but no pressure.....any ideas???? Just ran a test and put 6v to the old fuel pump....it runs....means the new pump is also good, so what the heck is stopping it from comming on????
Last edited by playsdixie; Nov 23, 2017 at 05:44 PM.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
Review what you did, including pulling fuel pump, if necessary. Check connections both electrical and fuel. Pulsator should have been replaced with short section of hose. Be sure something didn't come loose.
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,213
Likes: 1,173
From: Southlake, TX
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,213
Likes: 1,173
From: Southlake, TX
I rigged up a tester wire alligator clip for mine when I swapped. I was able to test it; you only need a few seconds to confirm that the motor is working.
If it tests out, you will need to move "up stream" and pull a pressure reading from your fuel rail. When was the last time you changed your fuel filter?
If it tests out, you will need to move "up stream" and pull a pressure reading from your fuel rail. When was the last time you changed your fuel filter?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
it's been awhile for the fuel filter....needs to be changed but kind of ruled it out troubleshooting this as there is zero pressure....of course now it's all coming together....I had a few instances this summer when the car died, coasted to a stop and it restarted right away....hadn't gotten to the bottom of that when it died and didn't come back....i'm pretty sure the new pump is ok, just like the old pump which worked when I bench tested it.....i'm leaning towards thinking this is a ground issue....just have to figure out where the pump is grounded on the car to check...hate to think there's something wrong with the wiring..... not my forte 
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
well, it's not the fuel pump....did some checking, 12 volts at all fuses but the one marked FP. not getting power to the fuse.....any ideas would be helpful, not good at wiring problems 
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
Do you have factory manuals or wiring diagram? Fuel pump fuse is powered up after relay and oil pressure switch. Check oil pressure switch and connector. Also check power and ground to relay.
Last edited by Kevova; Nov 25, 2017 at 01:26 PM.
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
that's exactly going to be my next step....i've ran out of ideas so best to start at the beginning again...that or try to trace that damn wire from pin A of the relay to the fuse box.....thanks ....
Race Director
Joined: Aug 2007
Posts: 11,889
Likes: 8
From: Whitefish Falls Ontario
St. Jude Donor '08-'09
If you put 12v to A of the relay, you should have got 12v to the pump fuse, and operated the pump. Since you didn't, you must be missing the ground. When I had this problem with my 84 I ran a new ground to the tank. (84 uses the same basic circuit as the 85), problem solved.. 
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 763
If you put 12v to A of the relay, you should have got 12v to the pump fuse, and operated the pump. Since you didn't, you must be missing the ground. When I had this problem with my 84 I ran a new ground to the tank. (84 uses the same basic circuit as the 85), problem solved..
- that would be my guess....
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
had two threads going on this so I'll address both...wvzr-1 was correct...it was the bulkhead connector...a wire underneath the plate....fixed it, runs like a champ....thanks to everybody for your input....wouldn't have this car without the help I get from the forum...... wish I had known what a bulkhead connector was....didn't get it at first.....quite an education.....Paul 