I have someone telling me there's more than one version of the Walbro 255 - one is "high flow" and the other isn't? I just picked one up, here are the numbers:

GSS342
20705-2

Anyone got info?

Thanks!

 

The gss342 is the one you want.

 

you got the right one, i on the other hand got the 341 (1G DSM) and have to return it LOL.

 

Well, nobody seems to advertise a difference. Aren't they both 255 lph???

 

GSS-342 is the Evo high pressure pump. GSS-317 is the Evo low pressure model.

 

Thanks, but sorry I've not yet been clear. What are the quantitative differences?

 

http://www.roadraceengineering.com/f...pflowrates.htm

Here you go.

 

Interesting - thanks!

 

how would you notice? What would your car run like with the low pressure model.


If I purchased my fuel pump from lancershop.com and bought a Evo specific one that would be the right one?

 

The easiest way to determine which one you have is to look at the part number on the pump. Other than that you would not be able to tell a difference unless you had an aftermarket fuel pressure regulator in which you turned up the pressure on your fuel system. Then, you would notice that your AFR becomes inconsistant and would eventually get to a point in which you would not be able to add fuel. If you bought yours from LancerShop, you should have the High Pressure model unless you specifically wanted the low pressure.