90 ZR-1 Quit - ZR-1 Net Registry Forums

vetteguy48 · 07-26-2021

Hey everyone..looking for some advice. Driving my 90 ZR-1 (12.5k miles) to work this morning and it suddenly quit. it felt like it just ran out of gas, but no sputtering...rpms just dropped to nothing and then out. coasted to the side of the road and tried to restart...but it just cranked away. Full tank of gas and no other issues have every popped up. I have owned the car for a year and put about 2K miles on it with no problems. Anyway the only thing i was able to glean from searching other posts was possible problem with fuel pump lines coming off in the tank. Had the car towed to our local Vette shop here, which happens to be closed today, and will talk to them tomorrow. Any other thoughts from you would be super appreciated.

Matt B · 07-26-2021

Check if the car starts when cold and let it idle to warm up. During start up and cold coolant both pumps work whereas the secondary will shut down as coolant warms up. So if the engine stops the primary is likely to be out.

For sure the pros here also have more sophisticated procedures but this should be a good starting point.

Good luck!

Sent from my SM-G991B using ZR-1 Net Registry mobile app

PhillipsLT5 · 07-26-2021

Primary fuel pump bad? Try the fuel pump jumper from Jim voter

Sent from my iPhone using ZR-1 Net Registry

vetteguy48 · 07-26-2021

Thanks for the tip. I did try and start it again after we towed it to the shop (they're not open today). No luck. I'll pass the information on to my mechanics when they get to work tomorrow. Any other tips really welcome. The shop in Olympia (Capital Corvette) is really good and super supportive, but have limited experience with the LT5 so help is appreciated.

vetteguy48 · 07-26-2021

Just read the Jim Voter posts. Great stuff. I will try and reach out to him. thanks

Paul Workman · 07-30-2021

Fuel-Air-Spark?

Nothing to add to what Jim Voter may have said/written, but am curious to hear what you finally come up with!

QB93Z · 08-01-2021

Quote:

Originally Posted by vetteguy48

Hey everyone..looking for some advice. Driving my 90 ZR-1 (12.5k miles) to work this morning and it suddenly quit. it felt like it just ran out of gas, but no sputtering...rpms just dropped to nothing and then out. coasted to the side of the road and tried to restart...but it just cranked away. Full tank of gas and no other issues have every popped up. I have owned the car for a year and put about 2K miles on it with no problems. Anyway the only thing i was able to glean from searching other posts was possible problem with fuel pump lines coming off in the tank. Had the car towed to our local Vette shop here, which happens to be closed today, and will talk to them tomorrow. Any other thoughts from you would be super appreciated.

Your jumper is on the way to you. For some long-distance trouble shooting, how long did the ZR-1 run before it stalled?

Jim

secondchance · 08-01-2021

I think coolant temp triggers secondary pump shut off. If I remember correct, 167 degrees.

QB93Z · 08-02-2021

Quote:

Originally Posted by secondchance

I think coolant temp triggers secondary pump shut off. If I remember correct, 167 degrees.

That is what I remember also, I was hoping to determine if the engine quit at about that time interval so we could "confirm" a failed primary fuel pump at cold startup.

Jim

07-26-2021	#1
vetteguy48 Join Date: Aug 2020 Location: Olympia, WA Posts: 11	90 ZR-1 Quit Hey everyone..looking for some advice. Driving my 90 ZR-1 (12.5k miles) to work this morning and it suddenly quit. it felt like it just ran out of gas, but no sputtering...rpms just dropped to nothing and then out. coasted to the side of the road and tried to restart...but it just cranked away. Full tank of gas and no other issues have every popped up. I have owned the car for a year and put about 2K miles on it with no problems. Anyway the only thing i was able to glean from searching other posts was possible problem with fuel pump lines coming off in the tank. Had the car towed to our local Vette shop here, which happens to be closed today, and will talk to them tomorrow. Any other thoughts from you would be super appreciated.

07-26-2021	#2
Matt B Join Date: Jan 2021 Location: Beautiful Bavaria Posts: 522	Re: 90 ZR-1 Quit Check if the car starts when cold and let it idle to warm up. During start up and cold coolant both pumps work whereas the secondary will shut down as coolant warms up. So if the engine stops the primary is likely to be out. For sure the pros here also have more sophisticated procedures but this should be a good starting point. Good luck! Sent from my SM-G991B using ZR-1 Net Registry mobile app __________________ ZR-1 #638/1991

07-26-2021	#3
PhillipsLT5 Join Date: Aug 2005 Location: Scottsdale, AZ Posts: 2,446	Re: 90 ZR-1 Quit Primary fuel pump bad? Try the fuel pump jumper from Jim voter Sent from my iPhone using ZR-1 Net Registry

07-26-2021	#4
vetteguy48 Join Date: Aug 2020 Location: Olympia, WA Posts: 11	Re: 90 ZR-1 Quit Thanks for the tip. I did try and start it again after we towed it to the shop (they're not open today). No luck. I'll pass the information on to my mechanics when they get to work tomorrow. Any other tips really welcome. The shop in Olympia (Capital Corvette) is really good and super supportive, but have limited experience with the LT5 so help is appreciated.

07-26-2021	#5
vetteguy48 Join Date: Aug 2020 Location: Olympia, WA Posts: 11	Re: 90 ZR-1 Quit Just read the Jim Voter posts. Great stuff. I will try and reach out to him. thanks

07-30-2021	#6
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: 90 ZR-1 Quit Fuel-Air-Spark? Nothing to add to what Jim Voter may have said/written, but am curious to hear what you finally come up with!

08-01-2021	#8
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,717	Re: 90 ZR-1 Quit I think coolant temp triggers secondary pump shut off. If I remember correct, 167 degrees.