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Author Topic:   tapping into fuel line
scotts152001 posted 04-21-2002 10:29 PM ET (US)   Profile for scotts152001   Send Email to scotts152001  
My Montauk fuel filter does not have a separate port, so I'm planning on taping into the 3/8" fuel line with a T after the fuel filter. I have a 90 Ficht and a Yamaha 4 stroke kicker. Any problems with this approach?
lhg posted 04-21-2002 10:46 PM ET (US)     Profile for lhg    
I assume you are talking about a boat mounted water separating fuel filter. Since you're not running a built-in tank, I don't think these are really necessary, but if so, I would install a new one, one that has the two inlet ports and two outlet ports, such as made by Mercury or Tempo and others, for about $34. Then each engine will have it's own fuel feed and primer bulb, with no need for 3 way valves. You only need one 3/8" line into the separator.

Incidentally, I'm not familiar with a fuel injected Ficht, but with an Optimax, they tell you specifically NOT to use a fuel filter, since the engine already has one on it.

Clark Roberts posted 04-22-2002 08:22 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Scotts, suggest that you check with Ficht experts to see if kicker engine could un-prime (real word??) the fuel injection on the main engine! The best and safest system would be to have separate tank pick-up and lines for each engine. In any case, study it all out and make sure that a fuel problem with one engine will not cause problems in the other! A single point failure, like a clogged tank pick-up, could render both engines unuseable! That's my story and I'm sticking to it! Beam me up... clark... Spruce Creek Navy
lhg posted 04-22-2002 02:59 PM ET (US)     Profile for lhg    
Clark - for 16 years now, I have run the two engine fuel lines, each with their own primer bulb, on my twin 115's from one filter, with the two separate take-offs. I checked with Mercury before doing this, and they said the filter would handle 60 GPH and it would not be a problem. There has never been a problem of one engine sucking the fuel from the other when only one is in use, such as trolling. I assume the filter design and the check valve in the primer bulbs would also prevent this.

On the 18 Outrage, there is only one fuel withdrawl from the tank, and the fuel manifold is fed with a single 3/8" Whaler installed fuel hose. The copper fuel manifold does have two withdrawl fittings, however, in case one wants to use two filters, or run two feeds into a single filter, as I have done. Incidentally, nowhere in this boat (1986 model) could I find a factory installed anti-siphon valve.

On a related subject, when I ran a kicker on my Nauset, I made sure both engines had the same fuel line connection. I only used one fuel line in the boat, which I switched back and forth, since the two engines would never be run at the same time. I always thought 2 separate fuel lines in a 17 is unnecessary clutter. With two different brands of engines, a little pigtail converter could be added to the Yamaha kicker to take the OMC connector, or visa-versa.

Clark Roberts posted 04-22-2002 04:48 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Larry, I too have run twins rigged as you describe above with no problems... enter the Fichts and other DFI's and things are new to me! My 135 Opti had a very specific fuel (and oil) priming drill, all controlled by the engine control module (ECM) and like you mentioned Merc discourages use of any in line fuel filter other than the stock (under cowling) filter with "water in gas" alarm. I'm not sure how fuel flow is checked and am more ignorant about the Fichts. That's why I urge some factory advice 'cause these DFI's are another whole ball game.... Happy Whalin'... Clark... SCN

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