fuel pump upgrade L98

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Mar 27, 2012 | 03:18 PM

leesvet

Thread Starter

Safety Car

Joined: Apr 2011

Posts: 3,660

Likes: 22

fuel pump upgrade L98

I've been doing some test and its time to buy a new fuel pump. I notice that the stock pump fails to maintain pressure over 2500-3000 rpm and drops off radically above that speed. I want a decent pump thats a direct drop-in replacement without going exotic. Whats the reccomended replacement ?
Is there a pump from a later yr model that will give the extra fuel vol & pressure or do I need to go aftermarket?

I was pretty shocked at how far the pressure drop was under hard accelleration and into higher rpm....about a 50% drop in pressure. It levels right out when the rpm stabilizes but under accelleration it just plain stinks......

Mar 27, 2012 | 03:47 PM

Aardwolf

Race Director

Joined: Jun 2004

Posts: 13,963

Likes: 709

From: WI

Racetonix had a nice sale and I got a Walbro 190 lph with install kit from them. It's great! After switching to E85 and 46 # injectors I thought it may be to little flow. After testing it's still fine! A lot of people get the 255 lph since it doesn't cost that much more. There could be some advantages with not overflowing the system though. Fuel may end up cooler and less amp draw. I have around 350 hp if that helps.

Mar 27, 2012 | 04:05 PM

TTOP350

Racer

Joined: May 2011

Posts: 293

Likes: 4

X2 with Racetronix, I use a 255LPH pump in all my cars.

Mar 27, 2012 | 04:17 PM

pmihaltian

Slingshot

Joined: Dec 2001

Posts: 3,817

Likes: 24

From: Charlotte NC

I installed a Walbro 255 a few years ago and never looked back. Been working fine ever since.

I think I paid about $65 - $75 for the pump which was a direct drop in replacement.

Mar 27, 2012 | 05:32 PM

caddyboy84

Burning Brakes

Joined: Nov 2011

Posts: 841

Likes: 1

I bet you have a clogged filter and pump "sock", when you change the pump use the green screen "sock", it stays rigid and open. I had a Carter and a small cloth "sock" that was filthy and probably was collaspsing under load. The pump worked so I kept it as a back-up and bought a new screen "sock" for it, I re-installed a new A/C delco direct replacement, the pressure is 49psi key-on and 38 at idle. Car runs awsome

and I swear by Delco stuff.I picked mine up from Global Automotive of Miami part # EP375 and it was around 50 bucks.

Last edited by caddyboy84; Mar 27, 2012 at 05:43 PM.

Mar 27, 2012 | 05:52 PM

ch@0s

Le Mans Master

Joined: Oct 2008

Posts: 9,758

Likes: 49

From: Houston Texas

Quote:

Originally Posted by TTOP350

X2 with Racetronix, I use a 255LPH pump in all my cars.

X3
Its a very nice kit.

Quote:

Originally Posted by ch@0s

I also put in my new Racetronix 255 pump. This kit is great and complete. It came with everything and some nice SS screws.

Mar 27, 2012 | 06:40 PM

WW7

Le Mans Master

Joined: Aug 2007

Posts: 8,735

Likes: 413

From: WV

http://www.racetronix.com/RX-C4369-FPKG-2.html

Mar 27, 2012 | 07:53 PM

leesvet

Thread Starter

Safety Car

Joined: Apr 2011

Posts: 3,660

Likes: 22

cool !

I appreciate the input. I already went thru the pump/strainer and filter. The pump screen did have some gel goop that was blocking the inlet but thats been cleaned and its all clear. Without vac on the regulator I easily get over 50 psi but the flow drops radically under hard accelleration when the inj are really opened up dumping fuel in...from 50+ psi to 20 during that time. Not acceptable.
For the price that "kit" is a no brainer. Stock pumps cost almost that, so I'll be ordering one here real soon....

I considered a ZR1 duel pump/sender assy that is available but thats more plumbing and adapting stuff and still limited by the steel tubing ability to carry a specific amount of fluid under pressure. A better pump that can keep up with the engine demand is the simple solution...
Thanks guys !