Fuel pump?

Tim · September 01, 2002, 10:32:25 AM

To give a breif history....
About a two weeks ago my 90 TGp died as I was driving. (Wasn't GOOD) I tried to restart but it wouldn't. I sat for a minute tring to think what could be wrong. I tried to start it about a minute later and it started up with no problem like nothing had ever been wrong. It was fine since until yesterday. It would randomly shut off. I could either be driving or it idling. It would always restart sometimes immediately sometimes I would have to wait a minute or two. finally as I am trying to get it home it dies and will not restart . I verified that it was getting spark with a tester and I had a buddy go buy a fuel pump relay. I checked all the fuel fuses. still nothing. finally I get out the fuel pressure guage and it has no pressure what so ever. I tried to see if my pump was running at all when I turn ignition to on but I was on a busy road so I am not sure if I would have been able to hear it anyway. Well anyway I had it towed and I am looking for the correct fuel pump. I know the pump is not the same as the normally aspirated GP.

Does anyone have the part number for it? Or is there anything that I did not check that could cause these symtoms? I FPR would not shut off pressure completely would it?

I am pretty sure its the pump. is it hard to change it or should I have a shop change it? I have never changed one before and I am not excited about working with fuel in a parking lot. I do all of my repairs at home but I am at school right now away from my home garage?

Any help would be appreciated.

Black Pheonix · September 01, 2002, 11:17:21 AM

it might be pretty tough to change, its in the fuel tank so you have to drop it, mostly just man hours, make sure its your fuel pump though, it could be anything, mine was a coolant sensor. Who cares about a coolant sensor anyways? BTY i am not so sure they make our fuel pumps anymore, maybe they do, but when TGP get the heads upgraded they have to get a new fuel pump so maybe you should check into that pump. Just one more exuse to mod.

skalor · September 01, 2002, 11:34:56 AM

I believe that our fuel pump is same pump that is used in the corvette of the same year. I wouldn't bother with the stock GM pump, I would get a Walbro pump instead. My brother put one in his S-10 that we're converting to a Series II 3800 from a camaro and I've heard that Grand National and Sy/Ty guys use them too. Maybe ask Jeff M. to make sure it's compatible, but I'm pretty sure we can use them. here's a link to a site that sells them, just click on "In-tank fuel pump" and the price is at the bottom. I would get the 255 high pressure, but that's just me :)

http://www.autoperformanceengineering.com/

Tooky · September 01, 2002, 04:42:09 PM

I run the Walbro "GSS340M" 255 LTR/HR High pressure pump in my Syclone and it works fantastic, good to 600HP / 11 seconds. It is a little noisier than the factory pump though, you hear that "zzzztttt" noise winding out (not a big deal to me). I think with the TGP the 190 LTR/HR would be enough but it is not much more $ for the bigger ones. I guess I would ask Jeff M which one he recommends.

Chris A · September 02, 2002, 02:38:16 PM

Quote from: TookyCatI run the Walbro "GSS340M" 255 LTR/HR High pressure pump in my Syclone and it works fantastic, good to 600HP / 11 seconds. It is a little noisier than the factory pump though, you hear that "zzzztttt" noise winding out (not a big deal to me). I think with the TGP the 190 LTR/HR would be enough but it is not much more $ for the bigger ones. I guess I would ask Jeff M which one he recommends.

12 year old pumps definitely need to be replaced. In some cases just to get running right, replacing with the factory part will fix alot of problems. They still do make the right pump, AC Delco number ends in 375. However, a Walboro pump should be an easy swap in, but probably overkill. I can't think of any disadvantage besides increased fuel filter changes (FP pumps 255ltr/hr whether engine uses it or not, it just keeps circulating and getting filtered).

Sounds like the possibility of a fuel pump in this case. When it doesn' t start, see if there is the sound of the fuel pump priming in the tank when you turn the key. Open the fuel tank and listen there. Also, if it doesn't start try banging on the tank with a heavy object like a hammer. If it starts , its definitely the pump. YOu could use a fuel pressure guage too.

Mark Brownfield · October 06, 2002, 05:19:52 PM

Hey
I'm new to the Board. I have a 90 STE Turbo that is sitting in my driveway right now with two bad injectors. My car was acting exactly as you are describing. Good luck with the fuel pump change...but if it continues to act up...check your injectors. All you do is (well once you get down to them) hook an Ohm meter to them and they should read between 12 and 13 (approximately). One of mine was reading 4 and one was reading 9...indicating a short circuit.

turby · October 06, 2002, 05:28:32 PM

Hey Mark, Nice to see you here. How's it going with the car?

idbeast · October 07, 2002, 12:12:57 PM

Two different things will cause this problem...
1) DIS Module (most likely)
2) Crank sensor
Hope this info helps :mrgreen:

corvette · October 08, 2002, 08:54:12 PM

I pulled a pump out of a Z-28 parts car, it is exactly the same physical and electrica, but on the mounting is a device the parts book call a 'PULSATOR', any one have any idea :idea: what the hell this thing does, for real! :?: :?:

skalor · October 08, 2002, 09:11:08 PM

check out the site:
http://www.autoperformanceengineering.com/

click on In-Tank fuel pump and then scroll and scroll and scroll...right near the bottom is the installation notes, I suggest you read them.

Tooky · October 08, 2002, 11:19:22 PM

Don't reuse the Pulsator, throw it over your left shoulder. If you buy a good fuel pump like APE's Walbros, they come with a hose and clamps which specifically replaces the Pulsator. The Pulsator just leaks and crap.

corvette · October 11, 2002, 09:55:15 AM

Thanks for the info on the pulsator. I will trash it, and also consider the Walbro pump as the replacement.
Thanks again. :D

(I'll probably even drop pull the IROC pump and replace it also. Good info)

GPChief · October 11, 2002, 03:23:51 PM

What is the part # for the new "Walbro" fuel pump that can be used?

HiZ · October 20, 2002, 09:57:39 PM

fpg001,2,or3

look on the site for the flow that you want

1trucavalier · October 23, 2002, 10:10:22 AM

while your at it whats the part # for the stock injectors? I went to pepboys and they told me they were $27ea as you imagine i quickly excited the building! Dealer said $124ea I laughed and left I could probably get rc eng to fix mine for that price.