Engine quits after 7 minutes - Page 4 - ZR-1 Net Registry Forums

Paul Workman · 10-23-2021

Quote:

Originally Posted by kieranod1

To all you guys out there, I'm sorry for doubting you! You were right, my new #1
fuel pump had failed. I have it on the bench now and just need to source a new one, any recommendations? Thanks for all your help this, is a cool website and you guys are the pro's.

No problem. It is easy to assume a new part is working (has to be, right!?). But, truth is "infant mortality" is the #1 failure mode, even before MTBF (Mean Time Before Failure - a term statisticians use to define FAILURE RATE.)

Anyway, you're not alone. I replaced my pumps and one of them was "kaput" out of the box. The pumps drew enough current, but the check valve on one was completely "shlect"; threw me for a loop at first until I put the pressure gauge on the fuel rail: then it was obvious something was very wrong (still!) with the pumps. (I pulled the pumps, and with a piece of rubber tubing, I blew pressure with my mouth against the check valve. Sure enough, one of the check valves passed air backward easy as you please.) Never assume!!!

mhobtr · 10-23-2021

I wonder if there's any way to get the check valves unstuck.

I got two brand new OEM with bad valves that I couldn't return. Haven't had the heart to throw them away because I keep thinking that someday someone will post "That's not a problem, you just................!"

kieranod1 · 11-09-2021

Hi guys, thanks for your help, the Z is up and running again!

max76 · 11-10-2021

Quote:

Originally Posted by kieranod1

Hi guys, thanks for your help, the Z is up and running again!

What was the problem?

kieranod1 · 11-11-2021

Fairly new primary pump failed

Paul Workman · 11-13-2021

Yep! Several sources on failure rate Mean Time Before Failure (MTBF) refer to that phenomenon as "Infant Mortality". Just about everybody that endeavors to DIY repairs (me included) has fallen victim to installing a part, and just because it was a new part, assume it can't be the fault of the new part:

"It can't be the (whatever), cuz I just replaced it!"

Always verify operation, especially if the problem remains, OR (worse) if the symptoms return shortly thereafter!!

10-23-2021	#32
mhobtr Join Date: Apr 2016 Location: Birmingham, Alabama Posts: 60	Re: Engine quits after 7 minutes I wonder if there's any way to get the check valves unstuck. I got two brand new OEM with bad valves that I couldn't return. Haven't had the heart to throw them away because I keep thinking that someday someone will post "That's not a problem, you just................!"

11-09-2021	#33
kieranod1 Join Date: Mar 2016 Location: Pittsboro,NC Posts: 19	Re: Engine quits after 7 minutes Hi guys, thanks for your help, the Z is up and running again!

11-11-2021	#35
kieranod1 Join Date: Mar 2016 Location: Pittsboro,NC Posts: 19	Re: Engine quits after 7 minutes Fairly new primary pump failed

11-13-2021	#36
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: Engine quits after 7 minutes Yep! Several sources on failure rate Mean Time Before Failure (MTBF) refer to that phenomenon as "Infant Mortality". Just about everybody that endeavors to DIY repairs (me included) has fallen victim to installing a part, and just because it was a new part, assume it can't be the fault of the new part: "It can't be the (whatever), cuz I just replaced it!" Always verify operation, especially if the problem remains, OR (worse) if the symptoms return shortly thereafter!! __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry