18 horse sea horse

teamkuder

Recruit
Joined
Mar 3, 2008
Messages
2
i recently inherited a 18 hp johnson seahorse motor but with no fuel tank.is it possible to make a pressurized fuel tank yourself?or would gravity feeding the fuel work? i got it to start by gravity feeding fuel but it wont stay running also what is the oil mixture ive heard 50:1 and ive heard 24:1 if someone could help a brother out and let me know im forever thankfull.
 

tmcalavy

Rear Admiral
Joined
Aug 29, 2001
Messages
4,005
Re: 18 horse sea horse

Post the model number so you get the right advice on fuel mix, ie. pre-1964 was 24:1 or 16:1 (early 50's and on back), after 64 the recommendation was 50:1. The 18 hp seahorses were two-tone holiday bronze and white/creme, solid red and then green from 58 on back, went to white in 59 and on into the 60's. Color scheme should put you in the ballpark initially, but need model number for correct id/year. If it doesn't have a fuel pump...guessing it doesn't cause you ask about making a homemade pressure tank (nix on that), you can convert it to a modern one-line tank for about $75. You can find decent two-line pressure tanks for about the same or less. Check the aomci site as advised, they have a free classifieds section...also see them regularly on schmebay.
 

wbeaton

Commander
Joined
Jul 30, 2006
Messages
2,332
Re: 18 horse sea horse

The 18 hp came out in 1957. The 1957-58 was red (Holiday Bronze) and white. That is probably what you've got. If it takes a pressure tank it is definately 24:1 and from 1957-59. Find a good used pressure tank.
 

samo_ott

Vice Admiral
Joined
Jun 18, 2006
Messages
5,125
Re: 18 horse sea horse

And if you do want to convert it over to a single line fuel tank with a fuel pump, search the previous threads in this forum for adding a fuel pump, there's several of them.
 
Top