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Author Topic:   Fuel line diameter
Robob2003 posted 04-16-2004 04:27 PM ET (US)   Profile for Robob2003   Send Email to Robob2003  
I have a 1981 Johnson 100 HP and want to replace the fuel line, bulb and any fittings that need replacing.

It appears that a smaller diameter line goes from the tank fitting to the bulb and a larger one to the outboard.

Line to the outboard is gray and marked Sierra 2000 alcohol resistant with no diameter.

Is there a correct size or will a 3/8" or 5/16" work okay?

Thanks in advance,

Bob on Tampa Bay

Clark Roberts posted 04-16-2004 05:27 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Robo, either should work fine but I would opt for the 3/8" diameter for all line and fittings. Clark
Robob2003 posted 04-16-2004 07:16 PM ET (US)     Profile for Robob2003  Send Email to Robob2003     

Thanks very much for the good info.

I have seen many of your posts and have come to the conclusion that you really know your stuff.

Thanks again,

Bob on the other side of the state:-)

Joe Kriz posted 04-16-2004 07:34 PM ET (US)     Profile for Joe Kriz  Send Email to Joe Kriz     

Fuel lines are measured by Inside Diameter...
Therefore, the outside diameters may be different for different manufacturers. This is probably what you are seeing.. Also, there are different ratings for fuel lines which make the outside diameter larger.

I agree with Clark... If you are going to replace everything anyway, go with the 3/8" OMC/Bombardier fittings and 3/8" Inside Diameter fuel line...

You might even consider the Fire Resistant (up to 3 minutes anyway, or something like that) that is Coast Guard approved for internal tanks. This fuel line is even helpful when running the fuel hose through the tunnel on Montauks.

Dick posted 04-16-2004 08:56 PM ET (US)     Profile for Dick  Send Email to Dick     

The Sierra silver fuel lines come in both 5/16" and 3/8" and also two quality levels.
If you use Sierra go with the Silverado 2000 premium series. Part #18-8009 is the 5/16 with OMC fittings, #18-8058 is the 3/8 with OMC fittings.

Sierra fuel line is very good quality and is made by the Shields rubber company.


Robob2003 posted 04-17-2004 11:34 AM ET (US)     Profile for Robob2003  Send Email to Robob2003     
Dick and all,

Thanks for the good advice.

The line I am replacing is Sierra Silverado 2000 Premium and I intend to use the best quality. I'll use 3/8" ID.

All the fittings are metal and appear to be in perfect condition with no leaks.

Thanks again to all,

Bob on Tampa Bay

Robob2003 posted 04-20-2004 09:48 AM ET (US)     Profile for Robob2003  Send Email to Robob2003     
Using the good advice I got here I replaced the fuel line and all fittings with 3/8 ID.

I especially want to thank the person who posted in another thread the tip about using a fish tape to pull lines through the tunnel.

I ran the fish tape through the tunnel and into the end of the hose, clamped it with one of the old clamps and it came through like a shot.

Thanks again. I'm happy I bought an old Whaler for all that I have learned on this forum.

Bob on Tampa Bay

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