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Fuel Filter - Two Outlets?
|Author||Topic: Fuel Filter - Two Outlets?|
posted 05-03-2004 09:21 AM ET (US)
I have installed a small kicker to back up my ageing main engine. Following the advice on the site, I have installed two fuel stop valves on the filter to prevent air suck back. The fuel lines to both the main and kicker engines have priming bulbs.
The problem I have is that when I start the main engine (valve to main open, valve to kicker closed) the engine will not start as it is not receiving fuel, the bulb remain limp and will not prime? If I start the kicker engine and let it run for 5-10 mins, I can open the valve to the main engine and it starts first time. Is it possible that a vacuumn is being created in the filter or could my fuel lines be too long?
Grateful for any thoughts.
posted 05-03-2004 09:25 AM ET (US)
I would be interested to know where on the site the advice is given to insert stop valves or "check valves" in the fuel lines. My recollection is that most often there has been advice to remove them.
In the configuration you are describing, I think you want to install shut-off valves in the fuel line. By that I mean valves you operate manually to open or close the flow of fuel to the individual engines. This prevents one engine from sucking fuel and air back from another.
posted 05-03-2004 12:24 PM ET (US)
Jim, I read it as "stop cocks", an on-off valve, not check
And most of us have TWO check valves in each fuel line --
posted 05-03-2004 01:40 PM ET (US)
I am running 2 engines off the Fuel/Water filter and am not experiencing any problems.. One main engine and one 8 hp kicker. Sometimes I run them at the same time for a few minutes while chasing a larger fish or getting out of the way of other boats..
I don't think it necessary to have any shut off valves. The primer bulbs have check valves in them as Chuck mentioned. Why would you need anything else?
I may be wrong, but I see no need for shut off valves.
posted 05-03-2004 02:47 PM ET (US)
Joe is correct, at least that is my experience with twin carburated engines running off one water separator, with no other valves needed other than what is in the primer bulbs.
I can run one, or the other, or both together. My system on my 18 Outrage has two lines in to the filter (from the factory installed fuel manifold) and two lines out to the engines, with no shut-off valves.
posted 05-03-2004 03:44 PM ET (US)
Petcocks are a convenience under some circumstances, not a critical necessity under most others. They are particularly recommended though in the condition of a main motor with fuel injection and high pressure fuel pump, and a kicker with carbeurators. There have been circumstances when the condition without a fuel shut off on the kicker has allowed the main motor's fuel pump to draw air back through the kickers carb, run lean, and burn pistons. Don't know if there was a bad check valve in the primer bulb, if the bulb waz oriented horizontally or upside down or what. It's cheap and positive protection against that possibility
posted 05-03-2004 08:29 PM ET (US)
The mechanic at my shop was recommending dual shut off valves or a 1-in/2-out selector valve with a center-off position for an application like this.
Actually, I have the same set up as LHG: 2-inputs/2-outputs from a common fuel filter. Running one engine at a time without any trouble, as far as I can tell.
posted 05-03-2004 09:08 PM ET (US)
It sounds like I have somewhat the same setup...
My main tank from my Outrage 18 goes into one of the inlets on the Fuel/Water separator.
I then have a 3/8 inch fuel line going from one of the fuel/water separator outlets to my 150 HP evinrude with a primer bulb right before the engine.
The second outlet from the fuel/water separtor is a 5/16 inch line which goes to an Accu-Mix system, then a primer bulb right before it goes into the 8 HP evinrude kicker.
There are no manifolds, valves, or anti-siphon valves anywhere in my system.
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