My fuel pump has been going crazy lately and i have decided it's time to change it. I am gonna go with the Walbro 255. Is there a difference between the GSS340 and GSS341? Can i use one out of the mustangs? PPL make is sound like a big deal to swap out these pumps but i don't see what's the deal. I know vendors wanna sell their harness and plug and play stuff but why make it sound like its a huge job? Can i us ethe stock sock on the walbro 255? Thanks..I am not going with the Racetronix or LPE so please don't send me a link for those installs.

 

There is a good reason why the C5 has a specific pump designed for its bucket. If you want to carve up your bucket so you can use a generic Walbro instead of the Walbro GRJ420....

http://www.racetronix.com/Manuals/RX...escription.pdf

At the end of the day all the Walbro GSS34x and GRJ42x pumps are the same inside. Same gears, same brushes, same armature etc.

http://www.racetronix.com/Fuel_Pump_Ident.html

http://www.racetronix.com/307vs340.html

 

If u guys are using a Walbro GRJ420 pump and it is the direct replacement why do ppl make it sound like it is a big deal to wire it up. Alot of ppl suggest the plug and play harness instead of a butt connector or solder job..What is the big deal with sending the cannister in to have a vendor pump the pump in it?

 

anyone install a fuel pump in their C5 with out the cannister in the tank? Any pics and install tips? Will the Walbro 255 GSS341 fit and if not why. Can i use the stock sock? Can i use the sock that comes with the pump? Who sells the Walbro GRJ420 and how much?

 

A very small percentage of people have trouble moving the two level sender terminals into the upgraded Racetronix in-tank harness' connector.
Moving the terminals is as easy as releasing them with the supplied paperclip and locking them into the new connector.

The 97-02 C5's have the canister which loads from the back of the tank. This is what your car has. This canister assembly is relatively easy for the consumer to deal with compared to the 03-04 top-loaded canister which is very hard to remove and to work with. We conducted some field tests to see how the average person dealt with the 03-04 canister removal and modification. The results were less than favorable even with some shops / skilled labor. Having to drop the transaxle was a job in itself. We opted to offer the 03-04 C5A-FPA as a dealer-installed item to reduce the possibility of module damage which would require replacement at a considerable cost.
Since your car does not have this model of assembly it is irrelevant.

This customer has a good web page on the install:
http://www.cajundude.com/racetronix.htm

The module info can be found here:
http://www.lingenfelter.com/pdf/c5fu...structions.pdf

The GSS341, 342, 340 etc. will not work in the factory module and allow it to fill properly. This is because these models of Walbro pumps do not have a jet-pump assembly at the bottom.

The purpose of this jet pump is covered in the GM tech link posted here: http://www.racetronix.com/Manuals/RX...escription.pdf

We bundle the GRJ420/LPE fuel pump assembly with a new flex hose, filter sock, filter screen, in-tank wiring, PnP harness, booster interface kit and drain kit.

 

Are u saying that only the GRJ 420 will fit and work properly? GSS341,342 and 340 will not work for me? Why are ppl here seling them? Where can i buy this GRJ 420? So it isn't a big deal to put it in the cannister?

 

Walbro only supplies this pump complete in the lower bucket assembly. The GRJ420 comes pre-installed inside this new bucket from LPE and Racetronix. The new bucket is a proper match for the HP GRJ420 pump.

If you look at the manual description and the pictures of the pump bottoms we posted links for above it will be obvious to you why a GSS34x series pump will not work properly in this application.

 

So what r my options? There is no way that there are only 2 different assemblies LPE and Racetronix. How is everyone else installing 255 pumps?

 

ttt

 

Racetronix carries the LPE assembly. GM, Walbro and LPE have an exclusive agreement on this product. There is only one manufacturer of this type of pump. What bundled package and who you decide to purchase it from is all up to you.

Any other solution requires modification of the factory system which will disable some or all of it's functionality. As these systems become more complex your options for upgrade become fewer and more expensive.

 

Are u saying there is no way of getting the pump i need and put it inside the canister? I don't need the canister, i already have it. I just want the pump.

 

Has anyone here opened the factory canister and replaced only the pump? What did u have to change? What models number of pump did u use?

 

I've installed this...

http://www.racetronix.com/RX-C5-FPK-2.html

It required replacing the existing pump. I don't remember a cannister being replaced. Just the other components and the harness which is an excellent setup. There are other setups out there which are ususally part of more elaborate ($1800 plus)fuel system replacements . Do a search in the FI section for tons of info on them.

I for one can't recall anyone replacing the intank and not using the Racetronix or LPE unless they had custom units allowing the use of larger pumps. Again, only needed if 750rwhp plus is to be consistently supported.

Arnel