I have 2 Walbro 255lph fuel pumps sitting in front of me and I am stumped as to whats going on. I bought the first one from an Org member awhile back who told me that it was the non-HP model. He said I would be fine w/ this model unless I was boosting something crazy like 30psi. Well after further research everyone has told me he has no idea what hes talking about. So I went ahead and bought the HP model from a friend of mine who is also on the Org. Now that I have them side by side I see absolutely no difference. They both say GSS 342 on them and the only numbers that are different appear right underneath and they just look like the serial number. Im sure my friend sent me the HP the second time bc I know he knows what he's talking about. Do I have 2 HP model pumps or is there some other marking that would let me know otherwise, thanks guys!

Grant

 

it's the 255lph hi pressure version... you should use an aftermarket FPR to drop the base pressure back down.

Here's my old install page (minus pics):
http://webpages.charter.net/chunger/Walbro.htm

 

+1 They are both 255 high pressure.

 

+2 the GSS342 is the HP fuel pump.. it wouldnt matter what the other numbers are, as long as it says GSS342 its a HP pump.