Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Pontiac > Grand Prix
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools
Old 03-05-2009, 06:18 PM   #1
finkk
AF Newbie
 
Join Date: Mar 2009
Location: norway, Michigan
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Unhappy gtp fuel pump?

i have a 2001 gtp, just recently had my first problem. ran fine all day, and out of the blue i turned it on and it died out. over and over again. a few people looked at it and said i need a new fuel pump, unfortunately, because its so expensive. but one person mentioned a resistor, which i read a little about, sounds like not everyone knows about this? from my understanding, this can be as necessary as a new fuel pump? my pump is still reading at 20, i was informed i need 50... but this at least tells me its not totally shot, just not strong enough for a gtp. does anyone know or have experience with this fuel pump resistor? i could really use the advice....
finkk is offline   Reply With Quote
Old 03-05-2009, 06:21 PM   #2
BNaylor
AF Moderator
 
BNaylor's Avatar
 
Join Date: Jan 2005
Location: El Paso, Texas
Posts: 18,017
Thanks: 30
Thanked 54 Times in 42 Posts
Re: gtp fuel pump?

Welcome to AF.

The fuel pump resistor fix is only applicable to '97 - '00 model GTPs. The 2001 and up do not have one like the prior year models.

What is the fuel pressure reading at ignition to ON (fuel pump prime)? Or how did you get the readings?

The specs are 48-55 psi.

It sound like you need a new fuel pump.



__________________

'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8
'02 Oldsmobile Alero GL2 - LA1 3400 V6
'99 Buick Regal LS - L36 Series II 3800 V6
'03 Honda CR250R MX - 2 Stroke 250cc
'97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold)
Timeslip 08/12/06

AF Community Guidelines
BNaylor is offline   Reply With Quote
Old 03-06-2009, 10:20 AM   #3
finkk
AF Newbie
Thread starter
 
Join Date: Mar 2009
Location: norway, Michigan
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Re: gtp fuel pump?

I had 2 different mechanics look at it, and they both hooked it up to a computer. One told me its reading at 50, and one told me its reading at 20. I don’t get it. I was really hopeful I could get the resistor kit… now I know I need a new pump…
finkk is offline   Reply With Quote
Old 03-06-2009, 10:25 AM   #4
finkk
AF Newbie
Thread starter
 
Join Date: Mar 2009
Location: norway, Michigan
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Re: gtp fuel pump?

Huge mistake, good news. My car is a 2000, not 2001…
finkk is offline   Reply With Quote
Old 03-06-2009, 10:43 AM   #5
BNaylor
AF Moderator
 
BNaylor's Avatar
 
Join Date: Jan 2005
Location: El Paso, Texas
Posts: 18,017
Thanks: 30
Thanked 54 Times in 42 Posts
Re: gtp fuel pump?

Well, that is important info and makes a big difference.

Try the resistor bypass. See link.

Click here



__________________

'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8
'02 Oldsmobile Alero GL2 - LA1 3400 V6
'99 Buick Regal LS - L36 Series II 3800 V6
'03 Honda CR250R MX - 2 Stroke 250cc
'97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold)
Timeslip 08/12/06

AF Community Guidelines
BNaylor is offline   Reply With Quote
Old 03-06-2009, 12:50 PM   #6
finkk
AF Newbie
Thread starter
 
Join Date: Mar 2009
Location: norway, Michigan
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Re: gtp fuel pump?

can you explain the whole thing to me a little more clearly, i dont understand what the resistor is or does... if i replace it how long til i need to replace the fuel pump? is the resistor bypass the same thing or totally different? clearly im lost, can you please help?
finkk is offline   Reply With Quote
Old 03-06-2009, 02:26 PM   #7
BNaylor
AF Moderator
 
BNaylor's Avatar
 
Join Date: Jan 2005
Location: El Paso, Texas
Posts: 18,017
Thanks: 30
Thanked 54 Times in 42 Posts
Re: gtp fuel pump?

The resistor is not part of the fuel pump assembly itself but a separate part that can be replaced separately. It is part of the fuel pump control circuits. It ties into the fuel pump speed control relay. It gives the effect of having a two speed fuel pump. By bending the speed control relay tab #85 it prevents the relay from energizing which puts the fuel pump in high speed mode giving maximum fuel pressure. If the car works after this field fix is applied it means the resistor is bad not the fuel pump. If the fix doesn't work then you have another problem like a bad fuel pump. You do this for troubleshooting purposes only.

Here is the location of the part.

Click here



__________________

'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8
'02 Oldsmobile Alero GL2 - LA1 3400 V6
'99 Buick Regal LS - L36 Series II 3800 V6
'03 Honda CR250R MX - 2 Stroke 250cc
'97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold)
Timeslip 08/12/06

AF Community Guidelines
BNaylor is offline   Reply With Quote
Old 03-12-2009, 05:04 PM   #8
jrmy1krn
AF Newbie
 
Join Date: Oct 2008
Location: Toldo, Ohio
Posts: 27
Thanks: 0
Thanked 1 Time in 1 Post
Re: gtp fuel pump?

Ive had both problems with the resistor and the fuel pump in the past. One diference I can note was that when the resistor was bad and the fuel pump was good the car would run for 1-5 seconds before quiting. When the fuel pump was bad and the resistor had already been replaced a year or so earlier the car would not start at all. This may not be the case in all situations but it is what I experienced.
jrmy1krn is offline   Reply With Quote
Old 03-12-2009, 06:43 PM   #9
Fortune50
AF Newbie
 
Join Date: Nov 2004
Location: Iowa, Iowa
Posts: 43
Thanks: 0
Thanked 0 Times in 0 Posts
Re: gtp fuel pump?

Quote:
Originally Posted by jrmy1krn View Post
Ive had both problems with the resistor and the fuel pump in the past. One diference I can note was that when the resistor was bad and the fuel pump was good the car would run for 1-5 seconds before quiting. When the fuel pump was bad and the resistor had already been replaced a year or so earlier the car would not start at all. This may not be the case in all situations but it is what I experienced.
X2, my experience as well. A bad pump that caused my car to stall, would not then restart & stall after a few seconds on the 2nd attempt, or 3rd, or 4th, or...
__________________
1995 Toyota Camry LE beater sedan
1999 Toyota Camry XLE "less" of a beater sedan
1997 Pontiac Grand Prix GTP coupe (SOLD)
1999 Ford Taurus SE 24v (SOLD).
Family's cars:
1999 Mercury Sable LS wagon 24v.
1999 Ford Taurus SHO 32v.
2002 Honda Civic LX sedan.
Fortune50 is offline   Reply With Quote
Old 03-13-2009, 09:04 AM   #10
richtazz
stupidity should hurt
 
richtazz's Avatar
 
Join Date: Aug 2004
Location: Flint, Michigan
Posts: 10,129
Thanks: 2
Thanked 22 Times in 22 Posts
Re: gtp fuel pump?

Try Bob's resistor bypass to eliminate it as the cause. During fuel pump prime/start up, the PCM puts the pump in high speed mode bypassing the resistor, then switches to low speed mode through the resistor after the car starts. This is why it starts, then stalls within a few seconds when the resistor is bad. If the by-pass proceedure doesn't change anything, then a fuel pressure test is needed to see if it's the pump or something else.
__________________


Still waiting for the "good old days" I'll get to bore my future grandchildren with!
richtazz is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD


Tags
fuel pump , gtp
Go Back   Automotive Forums .com Car Chat > Pontiac > Grand Prix

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 04:41 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts