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BruceL
1st Mate

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USA
30 Posts
Initially Posted - 05/23/2010 :  09:30:04  Show Profile
I just upgraded to a Mercury 9.9 4 stroke
The fuel cell that came with the motor has 3/8 inch fuel line
I have my old OMC 6 gal metal cans with the standard
OMC fitting on the can, no I can’t change the fitting it’s molded into the can.
The old fuel line was 5/16.
So here is the question
If I use a 3/8 fuel line and put the Mercury fitting on one end and the
OMC fitting on the other side will I still get enough fuel out of the OMC
tank side to run the motor with out problems.
The mercury fuel inlet pin on the motor is .33 and the outlet pin on the OMC can is .25
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islander
Master Marine Consultant

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USA
4029 Posts
Response Posted - 05/23/2010 :  13:03:35  Show Profile
I'm not sure what you mean, Do you think you won't get enough fuel thru the 3/8 line? 3/8 is bigger than the original 5/16. Ether way its more than enough for a 9.9. Usually if you buy a new engine it comes with a new fuel tank or is Merc getting cheap? Why not get a new plastic tank with the right fitting and ditch the metal one. At the very least you won't have to worry about rust in your fuel. The whole set up isn't more than $20-$30 for a 6Gal can.
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jerlim
Master Marine Consultant

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USA
1484 Posts
Response Posted - 05/23/2010 :  13:20:05  Show Profile
I concur...IMHO - new motor, gets a new tank, fuel line etc...no reason to introduce any old issues/junk/gunk/rust to a new engine...
Edited by - jerlim on 05/23/2010 13:20:37
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 05/23/2010 :  13:30:53  Show Profile
I'm guessing that you want a spare. I was able to unscrew the actual barbed fitting that the fuel line was attached to on my old OMC can and replace it with a 3/8 quit release for Yamaha (I like theirs better). I did the same with the new tank and changed the fuel line fitting to match. You can't use 3/8 line with a 5/16 fitting, and a 3/8 OMC probably has a different pin size than the 5/16. You are probably out of luck if you have a quick release on the tank that you can't remove.
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 05/23/2010 :  19:44:32  Show Profile  Visit Leon Sisson's Homepage
<font face="Times New Roman"><font size="3">How about joining the two fuel lines with a 5/16"-to-3/8" hose barb? As for adequate fuel delivery for a 10HP 4-stroke, 1/8" I.D. would be plenty.

-- Leon Sisson
</font id="size3"></font id="Times New Roman">
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farrison
Navigator

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USA
166 Posts
Response Posted - 05/25/2010 :  09:15:24  Show Profile
Like Leon's suggestion, there are several ways you could adapt the old tank. I think it's a good idea to have a spare tank. We adapted an old OMC metal 6 gallon tank to use with a new Nissan 4 stroke (which came with a three gallon tank) by leaving the old connector on the tank and cutting the fuel line about 3 inches from it and adding the barbed, Nissan quick-disconnect type there with a hose clamp. Works great. With the tapered barbed connector, the fuel line size is a non-issue.

Paul

Paul
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cks
Navigator

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126 Posts
Response Posted - 05/25/2010 :  11:12:06  Show Profile
I too have a merc 9.9 (2005) that replaced a 2 stroke merc that had a 6 gallon tank. I considered keeping the 6 gallon tank until i realized quickly that you'll get as far with a 3 gallon tank with the new motor as you used to with the 6 gallon tank with a 2-stroke. In addition, with all gas containing ethanol as an additive, you may find it more advantageous to keep the 3 gallon tank so that the gas doesn't sit around as long.
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NautiC25
Admiral

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USA
957 Posts
Response Posted - 05/26/2010 :  10:33:30  Show Profile
I would start over with a plastic tank. It's not that expensive and like was mentioned, the metal will rust. Mine rusted pretty bad inside and out.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.