Fuel hose size on fuel rail

[tomoad]

on a 260/280/drag what size is the fuel hose? 3/8''? not the hose were the injectors are at, the hose that splits off after coming in on bottom of fuel rail. Mercury wants an arm & leg for there's and doesn't state what size it is. Looks like 3/8'' or maybe a metric size. I put a new 3/8'' line in from tank in boat to bottom of fuel rail but the other looked a different size.

 

[tomoad]

Correction I just went and looked and the hose is just a little bit littler than the 5/16 return line. So it must be metric

 

[Bobalouie]

If you are talking about the hose that goes from the top of the rail to the regulator, then from the regulator to the tank return fitting, then I think that is metric. It is definitely smaller than 3/8", but bigger than 5/16". I used 3/8" from the rail to the regulator and clamped the pee waddle out of it on the regulator slide. It fits tight on the rail side. Then I used a considerable amount of effort to get 5/16" hose over the regulator nipple on the return to tank side and put a new fitting in the tank to accept the 5/16" hose.

I used 1/2" from the tank to the pump, then 3/8" from the tank to the rail.

 

[tomoad]

I think 8mm

 

[merc326]

It is metric, 8 mm is correct. 5/16 will work fine though.

 

[suicidealli]

Better have used high pressure EFI hose or it won't last long!!!!JMO

Roy

 

[Brack]

....and throw the worm clamp in the trash,.......get ya some fuel injector clamp,....

 

[dragmerc]

what is a fuel injector clamp? oetiker?

 

[Brack]

http://www.amazon.com/AAS-Fuel-Injection-Clamps-FI6/dp/B0040CU0HM/ref=sr_1_2?ie=UTF8&qid=1400510029&sr=8-2&keywords=fuel+injection+clamp

 

[Bobalouie]

Yes, it is Oetiker from the factory.

 

[merc326]

I like the aeroquip fuel hose. It is a high pressure hose with a protective outter wrap.