Finally time for that fuel pump - F-Bodies Unlimited Message Board

**MikeM** · 12-24-2009, 05:51 PM

After owning a racetronix fuel pump, hot wire kit, and autometer fuel pressure gauge for 3ish years, looks like I'm finally getting around to installing them

I hooked up the fuel pressure gauge today to test the stock pump, and it was doing what I expected. 55ish at idle/part throttle, dropping to 50 at WOT & high RPM. Fuel tank is nearly empty now, so the pump goes in next week!

**MikeM** · 12-27-2009, 03:31 PM

Got the pump/hotwire kit in and tested it. Now holds 58-59psi at idle/part throttle. Drops down to about 52-53psi now at WOT in the upper RPM range, although it drops slower than before. Kinda strange, I thought others with the same kit said it held the pressure at WOT, but maybe not. I haven't read about them in years.

As for the kit, very nice! Extremely detailed instructions for the install, and they even went so far as to include the correct size paper clip to remove the fuel sender terminals from the stock plug

No instructions with the hotwire kit, but it's pretty idiot proof.

johnls1camaro · 12-27-2009, 07:39 PM

^ I have the same kit and really like it.

HAHAI1 · 12-28-2009, 04:27 PM

I am doing a Walbro in-line with a sump in my tank for the Chevy II. If I am not mistaken, it is the same basic pump as the Racetronix. I will also be hot-wiring it in my new fuse panel.

johnls1camaro · 12-29-2009, 02:20 AM

^yeah, same pump.. The racetronix pump does look cool, but i guess that doesnt matter when its in your tank..

Black 99 Bird · 12-31-2009, 09:28 PM

Been running this pump for about a year and a half, no issues.

BLK95-Z · 01-01-2010, 12:42 AM

I almost bought this pump yesterday but bought the walbro 255 instead....saved myself $60.

Wouldnt it hold better pressure with an aftermarket regulator to go with the pump? I mean if you went to the trouble to do a $400 upgrade your stock fuel system wouldnt a regulator be in order also?

**MikeM** · 01-01-2010, 03:48 PM

I don't know of anyone that makes a new regulator to fit in the tank. The best thing to do with the LS1 from what I've heard is to add a return line to the front of the car, and put a regulator near the rails. Upgrading the stock rails is usually done at the same time as that, I think.

I don't think I really need to go through all that trouble at this point. My injectors are only at 60ish% duty cycle, and the tune is spot on.

BLK95-Z · 01-01-2010, 06:11 PM

To be honest Im not that familiar with the LS1 fuel system thats kind of why I was asking..with the regulator being in the tank it sounds like alot of work to upgrade. I was just thinking possably a good regulator may keep your fuel pressure dipping a WOT since you know you have a good pump now.

I agree that what you have now is more than enough fuel at the pressure and %'s your at now. sweet car!

SSMOKIN LS1 · 01-06-2010, 10:04 PM

MY 255 puts out about 64psi at idle.

Blackbird · 01-08-2010, 10:54 PM

Quote:

Originally Posted by MikeM

Got the pump/hotwire kit in and tested it. Now holds 58-59psi at idle/part throttle. Drops down to about 52-53psi now at WOT in the upper RPM range, although it drops slower than before. Kinda strange, I thought others with the same kit said it held the pressure at WOT, but maybe not. I haven't read about them in years.

As for the kit, very nice! Extremely detailed instructions for the install, and they even went so far as to include the correct size paper clip to remove the fuel sender terminals from the stock plug

No instructions with the hotwire kit, but it's pretty idiot proof.

Mine holds 62 @ idle and drops to 58 under wot.

**MikeM** · 01-09-2010, 10:09 AM

What size injector are you using, and what fuel pressure gauge? I wonder if it only holds pressure with the smaller injectors. Next time I get on LS1Tech, I should probably do a search.

SSMOKIN LS1 · 01-09-2010, 05:28 PM

I'm running 30lb Ford SVO injectors and used just a normal fuel pressure guage on the end of my fuel rail.

**MikeM** · 01-19-2010, 10:34 AM

Finally did a search, and found an answer straight from Racetronix:
http://www.ls1tech.com/forums/fuelin...p-low-psi.html

Quote:

Nominal operating pressure should be between 58-62PSI. Idle pressure may drop slightly as the fuel system warms up. Under WOT fuel pressure may gradually drop as low as 52PSI. If your fuel pressure drops off more drastically then you may require the FPR relocation and / or the booster.

Sounds like I'm fine

**Fast Track** · 01-20-2010, 12:16 AM

Yeah, the problem is that the reg is in the back of the car. That pump is supplying more then enough fuel but the regulator can not keep up. Fuel pressure drop is only a REAL problem when it is inconsistent or is dropping too much.

12-24-2009, 05:51 PM	#1
MikeM Crescent Fresh Join Date: Jan 2002 Location: Louisville, KY Posts: 1,605 2001 TransAm	Finally time for that fuel pump After owning a racetronix fuel pump, hot wire kit, and autometer fuel pressure gauge for 3ish years, looks like I'm finally getting around to installing them I hooked up the fuel pressure gauge today to test the stock pump, and it was doing what I expected. 55ish at idle/part throttle, dropping to 50 at WOT & high RPM. Fuel tank is nearly empty now, so the pump goes in next week! __________________ 2001 TransAm, 416ci motor is in, 473HP/473TQ through stock intake/TB/MAF Specs can be found here. Newish Toy: '07 Ducati 1098 Daily Driver: '03 Accord EX Coupe V6 6spd

12-27-2009, 07:39 PM	#3
johnls1camaro Registered User Join Date: Mar 2007 Posts: 508	^ I have the same kit and really like it. __________________ cammed,stalled,sprayed wanna trade my zr1's http://www.fquick.com/johnls1camaro

12-28-2009, 04:27 PM	#4
HAHAI1 Yeah, its fast. Join Date: Jul 2001 Location: BFI Posts: 3,835 2000 Camaro Z28	I am doing a Walbro in-line with a sump in my tank for the Chevy II. If I am not mistaken, it is the same basic pump as the Racetronix. I will also be hot-wiring it in my new fuse panel. __________________ Matt M. 67 Chevy II Wagon - Nantucket Blue, 402 LS2, H/C/I, T56, Street Twin, CR front clip, 9" 4-bar rear w/4.11s, mini tub. 66 Chevy II Coupe - Danube Blue, 364 LSx, not sure what else just yet. 66 Chevy II 2dr Sedan - Aztec Bronze, front clip, T56, 9" 4-bar rear w/3.55s, 370 LSx turbo, mini tub, project. 67 Chevy II 2dr Sedan - Sierra Fawn/Fawn interior, 440+cid LSx planned, several years away.....

12-31-2009, 09:28 PM	#6
Black 99 Bird Registered User Join Date: Nov 2002 Location: Louisville, KY Posts: 216	Been running this pump for about a year and a half, no issues. __________________ 1999 6-speed T/A

01-01-2010, 12:42 AM	#7
BLK95-Z Registered User Join Date: Dec 2009 Location: Iroquois Park area Posts: 294 1995 Camaro Z28 M6	I almost bought this pump yesterday but bought the walbro 255 instead....saved myself $60. Wouldnt it hold better pressure with an aftermarket regulator to go with the pump? I mean if you went to the trouble to do a $400 upgrade your stock fuel system wouldnt a regulator be in order also? __________________ 1995 z28 hardtop M6, Moroso CAI, 58mm tb, new 355 with LE2 heads & intake, cc306, Speed Pro forged pistons, Eagle rods, EWP, Double roller, MSD 6AL, B&M short shifter, Mickey Thompson ET Street's, 4.10s, no interior-AIR/EGR/AC

12-27-2009, 03:31 PM	#2
MikeM Crescent Fresh Join Date: Jan 2002 Location: Louisville, KY Posts: 1,605 2001 TransAm	Got the pump/hotwire kit in and tested it. Now holds 58-59psi at idle/part throttle. Drops down to about 52-53psi now at WOT in the upper RPM range, although it drops slower than before. Kinda strange, I thought others with the same kit said it held the pressure at WOT, but maybe not. I haven't read about them in years. As for the kit, very nice! Extremely detailed instructions for the install, and they even went so far as to include the correct size paper clip to remove the fuel sender terminals from the stock plug No instructions with the hotwire kit, but it's pretty idiot proof.

12-29-2009, 02:20 AM	#5
johnls1camaro Registered User Join Date: Mar 2007 Posts: 508	^yeah, same pump.. The racetronix pump does look cool, but i guess that doesnt matter when its in your tank..

01-01-2010, 03:48 PM	#8
MikeM Crescent Fresh Join Date: Jan 2002 Location: Louisville, KY Posts: 1,605 2001 TransAm	I don't know of anyone that makes a new regulator to fit in the tank. The best thing to do with the LS1 from what I've heard is to add a return line to the front of the car, and put a regulator near the rails. Upgrading the stock rails is usually done at the same time as that, I think. I don't think I really need to go through all that trouble at this point. My injectors are only at 60ish% duty cycle, and the tune is spot on.

01-01-2010, 06:11 PM	#9
BLK95-Z Registered User Join Date: Dec 2009 Location: Iroquois Park area Posts: 294 1995 Camaro Z28 M6	To be honest Im not that familiar with the LS1 fuel system thats kind of why I was asking..with the regulator being in the tank it sounds like alot of work to upgrade. I was just thinking possably a good regulator may keep your fuel pressure dipping a WOT since you know you have a good pump now. I agree that what you have now is more than enough fuel at the pressure and %'s your at now. sweet car!

01-06-2010, 10:04 PM	#10
SSMOKIN LS1 Registered User Join Date: Jul 2001 Location: Bowling Green, Kentucky, US Posts: 809	MY 255 puts out about 64psi at idle. __________________ Brian Hogan 2001 Camaro SS 1998 Camaro Z28

01-09-2010, 10:09 AM	#12
MikeM Crescent Fresh Join Date: Jan 2002 Location: Louisville, KY Posts: 1,605 2001 TransAm	What size injector are you using, and what fuel pressure gauge? I wonder if it only holds pressure with the smaller injectors. Next time I get on LS1Tech, I should probably do a search.

01-09-2010, 05:28 PM	#13
SSMOKIN LS1 Registered User Join Date: Jul 2001 Location: Bowling Green, Kentucky, US Posts: 809	I'm running 30lb Ford SVO injectors and used just a normal fuel pressure guage on the end of my fuel rail.

01-20-2010, 12:16 AM	#15
Fast Track KYFU Sponsor Join Date: Jun 2008 Posts: 239	Yeah, the problem is that the reg is in the back of the car. That pump is supplying more then enough fuel but the regulator can not keep up. Fuel pressure drop is only a REAL problem when it is inconsistent or is dropping too much.

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