Running rough then dies
Thread Starter
Heel & Toe
Joined: Mar 2011
Posts: 15
Likes: 0
update (is it fuel pump now) Help!
Latest update. I installed the new fuel filter last night. Tried starting the car and it ran better, it didn't cough and sputter near as much but there is still an issue. Fuel pressure is only at about 12 PSI. So I guess I am now going to change out the fuel pump. Does anyone have instructions on changing the fuel pump? Is it inside the fuel tank or mounted somewhere else? Thank you.
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
Latest update. I installed the new fuel filter last night. Tried starting the car and it ran better, it didn't cough and sputter near as much but there is still an issue. Fuel pressure is only at about 12 PSI. So I guess I am now going to change out the fuel pump. Does anyone have instructions on changing the fuel pump? Is it inside the fuel tank or mounted somewhere else? Thank you.
Last edited by lucky131969; Mar 25, 2011 at 08:41 AM.
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
I was just trying to make suggestions...so you don't waste your time & money. If you want to assume you have a full 12 volts and a good ground at the pump....... Your car.....your call.
Thread Starter
Heel & Toe
Joined: Mar 2011
Posts: 15
Likes: 0
You are correct, especially with limited funds. I hate to assume, but I didn't have the schematics. I need to buy the shop manual, but haven't yet. Thanks for the relay and contact info. I will try that this weekend. Do you know where the ground is so I can make sure that it is clean.
Thanks again.
If needed, do you know installation procedure for the fuel pump?
Thanks again.
If needed, do you know installation procedure for the fuel pump?
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
You are correct, especially with limited funds. I hate to assume, but I didn't have the schematics. I need to buy the shop manual, but haven't yet. Thanks for the relay and contact info. I will try that this weekend. Do you know where the ground is so I can make sure that it is clean.
Thanks again.
If needed, do you know installation procedure for the fuel pump?
Thanks again.
If needed, do you know installation procedure for the fuel pump?
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Before intslling a new fuel pump--I would check the "fuel pressure regulator" on the fuel rail on the drivers side---I believ a 2000 has a return type regulator--see if it has an extra line that goes back into the tank--if so it is a return style--the newer one have a returnless system--Either way--they have been known to fail or plug up--a return type also has a vacuum line that plugs into your air bridge--
The regulator can be removed--If you can somehow just plug it off or bypass it --then see if you get full pressure--( somewhere in the 50 psi range----)
The regulator can be removed--If you can somehow just plug it off or bypass it --then see if you get full pressure--( somewhere in the 50 psi range----)
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
Nope. 97-98 only had the fuel pressure regulator on the rail. The OP already changed the filter; therefore, he changed the regulator as well.
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Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
You are correct, especially with limited funds. I hate to assume, but I didn't have the schematics. I need to buy the shop manual, but haven't yet. Thanks for the relay and contact info. I will try that this weekend. Do you know where the ground is so I can make sure that it is clean.
Thanks again.
If needed, do you know installation procedure for the fuel pump?
Thanks again.
If needed, do you know installation procedure for the fuel pump?
Thread Starter
Heel & Toe
Joined: Mar 2011
Posts: 15
Likes: 0
E-mail (thank you)
Yes, if you can E-mail the procedure that would be great. jslayden@sikorsky.com Thanks again for everyones input. I will try voltage readings and jumper out the relay first. If all of that is ok then I guess I will be dropping the fuel tank and changing out the pump. At least I am learning the car!
Burning Brakes
Joined: May 2010
Posts: 1,167
Likes: 2
From: Pittsburgh Pa
Sounds like a bunch of shooting in the dark. Did you check for codes in DIC to see if it gives you a more definitive direction to go in? These cars don't generally run like crap and not throw some code pointing to the issue.
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
Yes, if you can E-mail the procedure that would be great. jslayden@sikorsky.com Thanks again for everyones input. I will try voltage readings and jumper out the relay first. If all of that is ok then I guess I will be dropping the fuel tank and changing out the pump. At least I am learning the car!
85 = Ground
86 and 30 = 12 volts with key to "on"
If that is good, jumper 30 to 87.....see if you can hear the pump run.
Below is a thread, that contains pics of the fuel pump ground location.
http://forums.corvetteforum.com/c5-t...fuel-pump.html
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
No problem. Do checks at the socket first (using the pic above)
85 = Ground
86 and 30 = 12 volts with key to "on"
If that is good, jumper 30 to 87.....see if you can hear the pump run.
Below is a thread, that contains pics of the fuel pump ground location.
http://forums.corvetteforum.com/c5-t...fuel-pump.html
85 = Ground
86 and 30 = 12 volts with key to "on"
If that is good, jumper 30 to 87.....see if you can hear the pump run.
Below is a thread, that contains pics of the fuel pump ground location.
http://forums.corvetteforum.com/c5-t...fuel-pump.html
Thread Starter
Heel & Toe
Joined: Mar 2011
Posts: 15
Likes: 0
Its fixed!!! Yea!!!
Last update on this thread. First I want to thank everyone for their help, especially Lucky131969.
To make a long story short it ended up being the ground to the fuel pump. I now have 60 PSI at the fuel rail and the car is running great.
A couple of notes to hopefully help someone else. Relay contact were given to me and I verified all of these, but I found some differences. Contact 85 is 12 volts when the key is on not ground. Contact 86 is the ground to the coil of the relay. So the checkout just had contacts 85 and 86 backwards.
Another note; I had asked earlier about the ground to the fuel pump and somone tried to post a picture to the forum. I am not able to get pictures from the forum. I tried both my work comoputer and home comuter. Neither will show a picture. Can anyone get the pictures posted in the forums?
Thanks again,
Jeff
To make a long story short it ended up being the ground to the fuel pump. I now have 60 PSI at the fuel rail and the car is running great.
A couple of notes to hopefully help someone else. Relay contact were given to me and I verified all of these, but I found some differences. Contact 85 is 12 volts when the key is on not ground. Contact 86 is the ground to the coil of the relay. So the checkout just had contacts 85 and 86 backwards.
Another note; I had asked earlier about the ground to the fuel pump and somone tried to post a picture to the forum. I am not able to get pictures from the forum. I tried both my work comoputer and home comuter. Neither will show a picture. Can anyone get the pictures posted in the forums?
Thanks again,
Jeff
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
Last update on this thread. First I want to thank everyone for their help, especially Lucky131969.
To make a long story short it ended up being the ground to the fuel pump. I now have 60 PSI at the fuel rail and the car is running great.
A couple of notes to hopefully help someone else. Relay contact were given to me and I verified all of these, but I found some differences. Contact 85 is 12 volts when the key is on not ground. Contact 86 is the ground to the coil of the relay. So the checkout just had contacts 85 and 86 backwards.
Another note; I had asked earlier about the ground to the fuel pump and somone tried to post a picture to the forum. I am not able to get pictures from the forum. I tried both my work comoputer and home comuter. Neither will show a picture. Can anyone get the pictures posted in the forums?
Thanks again,
Jeff
To make a long story short it ended up being the ground to the fuel pump. I now have 60 PSI at the fuel rail and the car is running great.
A couple of notes to hopefully help someone else. Relay contact were given to me and I verified all of these, but I found some differences. Contact 85 is 12 volts when the key is on not ground. Contact 86 is the ground to the coil of the relay. So the checkout just had contacts 85 and 86 backwards.
Another note; I had asked earlier about the ground to the fuel pump and somone tried to post a picture to the forum. I am not able to get pictures from the forum. I tried both my work comoputer and home comuter. Neither will show a picture. Can anyone get the pictures posted in the forums?
Thanks again,
Jeff
I'm confused by a couple of things here. You repaired the ground to the fuel pump on the left frame rail?
Also, what did you use as your point of reference for checking 12 volts/ground at the relay socket....the numbers on the bottom of the relay...or the picture I posted? Reason I ask...I've never seen a C5, that the fuel pump relay ground was not at the most inboard/most forward contact...of the relay socket.
Thanks,
Thread Starter
Heel & Toe
Joined: Mar 2011
Posts: 15
Likes: 0
The ground wire I found loose was on the frame above and aft of the LH rear tire.
The contacts for the relay was the inboard most forward contact as you just indicated, but this is contact 86 not 85. I got this info from the bottom of the relay. I wasn't able to see your pictures or anyone elses either. I don't know if its something that I am not view correctly or not. Tried two different computers.
The relay sockets are like this:
87 86
85 30
forward -->
Does this match what you think?
Thanks again for your assistance.
The contacts for the relay was the inboard most forward contact as you just indicated, but this is contact 86 not 85. I got this info from the bottom of the relay. I wasn't able to see your pictures or anyone elses either. I don't know if its something that I am not view correctly or not. Tried two different computers.
The relay sockets are like this:
87 86
85 30
forward -->
Does this match what you think?
Thanks again for your assistance.