Trojan Boat Forum

Hi Guys,
I was wondering if someone can shed some light on the Tri Fly fuel system. more specifically the shut off valves. This morning I was looking at the engines, water separators and fuel system. As you can see in the picture below, the fuel filters are empty but the fuel valves are open. to me, that does not make sense. when the engines were winterized, I would have thought that the fuel valves would have been closed and then the engines run dry. Is there any other valves? I found 2 others on top of the fuel tanks but that's it. Also, would there be a cross over valve to migrate fuel from 1 tank to the other? Finally, how do I replace the water separators. is it just a matter of unscrewing the filter element or is there a drain plug on the filter housing?

Christian

Hey Christian, those are all the valves I was able to find on mine, also it's been my experience that there will always be air in the top of those see through filters.

I don't think there are any other valves unless a previous owner added later. You may however have a crossover valve but it's usually in a pretty obvious location.

Yes those are spin on/off filters. The in-line plastic see through filter on top of the engine on an inboard application is a no no. If you're going to use an in-line filter at the engine, it should be the metal canister type that have threaded ports which are used to tie into into fittings on metal lines from the pump to the carb. There should not be rubber fuel line on top of the engine from the pump to the carb. Do you have the tell tale clear hose going from the fuel pump to the bas of the carb? If so, do you see any fuel in it? A faulty pump may allow fuel to drain back and emptying that in-line filter.

Big D wrote:I don't think there are any other valves unless a previous owner added later. You may however have a crossover valve but it's usually in a pretty obvious location.

Yes those are spin on/off filters. The in-line plastic see through filter on top of the engine on an inboard application is a no no. If you're going to use an in-line filter at the engine, it should be the metal canister type that have threaded ports which are used to tie into into fittings on metal lines from the pump to the carb. There should not be rubber fuel line on top of the engine from the pump to the carb. Do you have the tell tale clear hose going from the fuel pump to the bas of the carb? If so, do you see any fuel in it? A faulty pump may allow fuel to drain back and emptying that in-line filter.

X2

Thanks for the info guys!

I will fix it. Any advice on the type of lines I should use from the pump to the carb? I assume copper? What schedule?

Christian

On my boat there is a cross-over valve. It is located under the aft deck. There is an access door located on the aft wall, behind the ladder between the aft bunks. If you crawl in on your back and look up, it should be tight along the wall, underneath the heater. It may be hard to find because it is tucked in there, and there may be wire bundles as well. Also, you may need a spotter to pull you out by your feet.

original were steel, but regs call for pressure line from pump to carby to be of "metal" the original Chrysler filters in line where your clear one is at have treaded ends and are quite spendy to purchase. The metal pipe used needs to be double flared also.