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I bought a 255lph fuel pump last year and never used it. I am looking to trade it for a 190lph pump but someone saiid that the part number should already be a 190 pump. The number on it is GSS242. Can anyone tell me the correct size of this pump? Thanks!
 

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I just sold a 190 with that part# on it. I think I bought it from BBK a while back. The gss340 is a 255. Why wouldn't you want a 255?
 

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These should be the correct part numbers for a Walbro 255 FP... I know the 307 is correct as that's what I have in my car.

GSS 307 = stand vol. 255lph

GSS 340 = high vol. 255lph
 

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I have an extra 255 that came with my ATI Blower kit for my 99 cobra. I was going to use it for my 88lx. Which one will I need for the 88? The gss 307 or the gss 340. My 88 is mostly stock but not for long. I am going to squeeze it over the winter.
 
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