does this pump require any modification to work in a 94 LT1 Z28?

Thanks.

 

TTT

 

I just put a Walbro FP in my 454SS truck. The kits come with everything needed for say a GM EFI application. It was pretty much plug n' play. I still have the oem FP in my LT1.

Oh, and I almost forgot to mention that you should get an AFPR if you don't already have one.

 

Why?

 

I put one in my 93 Trans Am and it was pretty easy. I could not use the stock mounting, so I made my own mount. You will need an ajustable fuel pressure regulator to possibly turn down or up the fuel pressure. When I installed my fuel pump, the pressure went a lot higher than i wanted it. I used the AFPR to get it exactly where i wanted it.

 

i got my kit from racetronix it has every you need to make it work in your fbody. only $150 at www.thunderracing.com

jesse

 

The LT1 F-body cars have a pump that is inside a plastic bucket. This bucket in combination with the fuel pump in it is designed to draw fuel from the bottom of the tank via suction. This keeps the bucket full at all times so that when the tank is low on gas and you are doing some hard cornering or acceleration the pump does not run dry and start aerating the fuel. This happens as the fuel sloshes from side to side in the tank leaving the center low on fuel. This can cause detonation and possible engine damage. The bucket also allows the car to operate with lower fuel levels in the tank due to its scavenging effect. The bucket can also effect motor cranking time as the priming time is reduced under certain conditions. The return line from the fuel pressure regulator is diverted back into the bucket via a filter sock inside so that the unused fuel also helps keep the bucket full at all times. Keeping the pump constantly immersed in gas within the bucket can extend the pump’s life by not allowing it to be exposed to open air. Open air within the tank contains moisture and in time will cause the pump to rust / seize up especially if left to sit for long periods of time without the tank topped-up (i.e. winter storage). The Racetronix pump assembly is modified so that it will seal in the bucket’s rubber check-valve so that its function is retained. The Racetronix pump assembly is fitted with a factory style fuel tube not a rubber hose. This hose is important as when the fuel module is placed back in the tank it must pivot which can cause the rubber hose to kink. This fuel tube is much more resistant to the solvents in today’s gas and it will not crack, split, swell and collapse like a rubber hose. The standard Walbro kit comes with a short length of 50PSIA rated rubber hose. The Racetronix fuel module is equipped with a one-piece soldered wiring harness made from mil spec. Teflon/silver wire. This is the same type of wire used at the factory as Teflon is the most resistant to deterioration when exposed to gas. This harness has a Walbro connector at one end and GM pins at the other which fit directly inside the factory connector. Due to the age of the F-LT1 cars much of the in-tank connectors are black / corroded due to age. The Racetronix harness replaces all these questionable components. The standard Walbro kit comes with a plastic coated in-line wiring adapter. This adapter must plug into the existing questionable factory in-tank wiring thereby adding additional connections and length.

If the bucket’s function or any of the other kit’s features are not important to you then a standard GSS307 or GSS340 255L/Hr pump can be retrofit onto the F-LT1 module. The Racetronix kit is not required to get an F-LT1 system running but rather as a better option in order to retain factory functionality and maximize pump performance.

Jack
Racetronix

 

exactly. you will need to dissasemble the orig. pump out of the "bucket", then fit the new pump into it. it will take some time, but not that big a deal. if you can raplace the pump, then you can figure out the bucket deal. Ive installed the gss340 before and would def. invest in the racetronix kit, it looks like exactly wht I thought someone should do along time ago.

chris

 

I have the Walbro 255lph pump (purchased from a board member). Is there a pump assembly/install package w/ the "plug and play" components to go w/ the Walbro pump I have or do I have to buy the complete unit (new fuel pump and pump assembly/harness)?
Thanks!

 

I'd also be interested in a kit to convert my 255 to the Racetronix level. I have one sitting in a box that I was going to install once my HP demands it.

 

No 'kit' that I am aware of. That is what one gets for the extra $$ it costs to buy a Racetronix marketed pump. You get a pump that is designed specificaly for the application.

 

How much do you think a shop will charge to do the work? How long does it take?

 

Agostino use to be able to do it in two hours which includes dropping the exhaust, rear axle, and tank.

Most shops charge book rate which is much longer & more expensive.

 

much easier to use the access panel method IMO. easier and faster.

jesse

 

Any guide to do the access panel (dimensions, etc.)