• This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.

Use 5/16" Fuel Line for Everything?

Status
Not open for further replies.
So first let me state what I think is "right" so people can correct me if I'm wrong.

From what I think I've read, all Seadoos in my 97 GSX's "class" came with both 6mm and 8mm Grey Tempo fuel lines. The 8mm was used for the fuel "supply", and the 6mm was used for the fuel "return" lines.

So, during the fuel line replacement process, the 6mm is "converted" to 1/4", and the 8mm is replaced with 5/16".

If the softer, black rubber "thermoid" fuel line I'm using compresses down on the 6mm fittings nice and tight, is there any reason why I can't use the 5/16" black fuel line for everything? I would think the only concern with using different fuel line size is adding restriction.

However, having said that, when I test-fitted piece of the 5/16" fuel line, it seemed like it went on very LOOSE. The zip-tie cinched it down nice & tight. I'm just wondering if this is normal. It seems to me that the 1/4" fuel line would have a tighter fit at the nipples, but not sure if that is necessarily better.
 
Last edited by a moderator:
Starting around your year Seadoo switched to 5/16" feed lines and the return line remained at 1/4".

If your fuel selector and strainer are 5/16" use 5/16" hose. If your selector and strainer are 1/4" use 1/4" hose.

On a stock ski there is no reason to over think it. A stock 787 will run fine on 5/16" or 1/4". The 951 went to 5/16".
 
Status
Not open for further replies.
Back
Top