Stalling Problem
Thread Starter
Racer
Joined: Apr 2005
Posts: 412
Likes: 0
Stalling Problem
I just got my 1990 ZR-1 and it has been running ok, but I am getting all the fluids changed and get a tune-up with filter, plugs, etc.
A few days ago it stalled out on me, and it felt and sounded like it was not getting fuel. I was almost home when it stalled out but managed to get it home with a few more starts and stalls. I cranked it up later that night and it ran fine. Then today, I started it and she was doing fine, but after five minutes or so it stalled again like it was running out of gas. Any ideas as to what is going on? It will start over and over, but it keeps stalling out. If I let it sit for a while it does fine, but after a short while it stalls out. What is your guys best guess as to what is going wrong?
TIA
A few days ago it stalled out on me, and it felt and sounded like it was not getting fuel. I was almost home when it stalled out but managed to get it home with a few more starts and stalls. I cranked it up later that night and it ran fine. Then today, I started it and she was doing fine, but after five minutes or so it stalled again like it was running out of gas. Any ideas as to what is going on? It will start over and over, but it keeps stalling out. If I let it sit for a while it does fine, but after a short while it stalls out. What is your guys best guess as to what is going wrong?
TIA
Racer
Joined: Oct 2002
Posts: 372
Likes: 1
From: Corunna Mi
Both fuel pumps are on when the car is started and at 176 degrees water temp one is turned off. See if you are losing fuel pressure about then. I think it is the secondary that is turned off. Your primary could be going bad or leaking.
Thread Starter
Racer
Joined: Apr 2005
Posts: 412
Likes: 0
Originally Posted by bad-zr1
Both fuel pumps are on when the car is started and at 176 degrees water temp one is turned off. See if you are losing fuel pressure about then. I think it is the secondary that is turned off. Your primary could be going bad or leaking.
No chance it is a filter, or some other problem?
If it is the fuel pump, anyone know how much it is, and how much of a pain it is to change it out?
Le Mans Master
Joined: Nov 2004
Posts: 5,761
Likes: 28
From: ontario Ontario
Originally Posted by Bell Curve
Is that the only thing it could be, because that sounds expensive.
No chance it is a filter, or some other problem?
If it is the fuel pump, anyone know how much it is, and how much of a pain it is to change it out?
No chance it is a filter, or some other problem?
If it is the fuel pump, anyone know how much it is, and how much of a pain it is to change it out?
Thread Starter
Racer
Joined: Apr 2005
Posts: 412
Likes: 0
I was hoping for more opinions as to whether or not everyone thinks it is a fuel pump problem, or could it be something else I could check?
Assuming it is the fuel pump/pumps, could it be clogged with varnish or debris? If so, is there a simple fix like a fuel additive to clear it or something? I am assuming the fuel pumps are in the tank so hopefully there is a cheaper fix?
Ok thanks for the reply, but if they are identical, why wouldn't I just order a GM fuel pump for the 90 ZR-1? Also, are there any aftermarket pumps for our cars?
TIA
Assuming it is the fuel pump/pumps, could it be clogged with varnish or debris? If so, is there a simple fix like a fuel additive to clear it or something? I am assuming the fuel pumps are in the tank so hopefully there is a cheaper fix?
Originally Posted by Cdn ZR1 Mike
If it is, the fuel pumps are inexpensive. Use the fuel pumps from a 1996 GMC Suburban with the 454 engine as they are identical to the ZR1 and will cost roughly$100 or so for both pumps.
Ok thanks for the reply, but if they are identical, why wouldn't I just order a GM fuel pump for the 90 ZR-1? Also, are there any aftermarket pumps for our cars?
TIA
Team Owner
Joined: Jul 2002
Posts: 37,053
Likes: 69
From: This city NEVER sleeps! Frank's back yard!
Originally Posted by Bell Curve
Ok thanks for the reply, but if they are identical, why wouldn't I just order a GM fuel pump for the 90 ZR-1? Also, are there any aftermarket pumps for our cars?
TIA
TIA
You could buy the ZR-1 specific item - it is the whole assembly as the manual says it is a non-serviceable item - costs over $1000.00. Get you hands dirty and save $800.00.
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Race Director
Joined: Nov 2002
Posts: 14,299
Likes: 3
From: S. Florida
Originally Posted by 8388
Another possibility could be the relay.
While it sounds like a fuel pump, you should start simple, then progress. A $ 0.05 fuse could be the problem, so open up your panel and take a look. I think it will be the fuse at the bottom, farthest to the right.
Keep us posted, and good luck.
Thread Starter
Racer
Joined: Apr 2005
Posts: 412
Likes: 0
Originally Posted by DDSLT5
Fuel pumps are easy to replace - I did it in 30 min. Pull the assembly from the tank, cut the zip ties and remove the hoses, old pump out, new pumps in.
You could buy the ZR-1 specific item - it is the whole assembly as the manual says it is a non-serviceable item - costs over $1000.00. Get you hands dirty and save $800.00.
You could buy the ZR-1 specific item - it is the whole assembly as the manual says it is a non-serviceable item - costs over $1000.00. Get you hands dirty and save $800.00.
I will check the relay as well. Besides the fuse, how else can you check it?
Also, I think I might have a vacuum leak because when I leave the key on without the motor running, I hear something cycle on every 50 seconds or so. Is that a symptom of a vacuum leak or something else?
As always, TIA
Safety Car
Joined: Aug 1999
Posts: 4,862
Likes: 118
From: Texas
Originally Posted by Bell Curve
Also, I think I might have a vacuum leak because when I leave the key on without the motor running, I hear something cycle on every 50 seconds or so. Is that a symptom of a vacuum leak or something else?
Race Director
Joined: Aug 2000
Posts: 12,110
Likes: 50
From: SW Michigan
Originally Posted by Bell Curve
Also, I think I might have a vacuum leak because when I leave the key on without the motor running, I hear something cycle on every 50 seconds or so. Is that a symptom of a vacuum leak or something else?
As always, TIA
every 50 seconds your fine, you need to worry when it cylces ever few seconds.
as far as the fuel pumps I just had mine out last night takes abut 20 minutes to pull it out and to install
the fuel pump change is easy and the extraction from the tank is easy
if you do it ill walk you through
also check out this webpage for all your ZR1 needs
www.zr1netregistry.com
go to "maintenance"
then click on "ZR-1 how to"
then fuel pump replacement!
even cheaper fuel pumps to use!
http://www.zr1netregistry.com/old_proj11.htm
Thread Starter
Racer
Joined: Apr 2005
Posts: 412
Likes: 0
Originally Posted by phrogs
every 50 seconds your fine, you need to worry when it cylces ever few seconds.
even cheaper fuel pumps to use!
http://www.zr1netregistry.com/old_proj11.htm
even cheaper fuel pumps to use!
http://www.zr1netregistry.com/old_proj11.htm
Also thanks for your offer to walk me through it. I'll check the relay this weekend, and if that is not the problem, I'll buy two of those pumps in the link you posted.
Thanks
Thread Starter
Racer
Joined: Apr 2005
Posts: 412
Likes: 0
You Guys Are The Best!
Originally Posted by 8388
Another possibility could be the relay.
Originally Posted by Z Factor
While it sounds like a fuel pump, you should start simple, then progress. A $ 0.05 fuse could be the problem, so open up your panel and take a look. I think it will be the fuse at the bottom, farthest to the right.
Keep us posted, and good luck.
I went straight to the fuse you described (it was the exact one btw)
, and sure enough it was blown. Replaced the little 10amp sucker and my beast is running great without any stalling after it warms up.As a newbie to the forum and ZR-1 ownership your help is greatly appreciated and invaluable!
