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I am tryin to clean up all my engine lines and place them in a plastic hose sleeve. I noticed my gas line starts rubber from the tank and runs to a rigid pipe that runs under the tunnel at the other end of the pipe it goes back to rubber before connecting to he water /gas filter. Why is this pipe here and is it needed?
I suggest you take a look around at all the parts info and photos we have on this site right on the front page link.
"OEM Parts Info and Photos".
You can miss that link at the top of the front page.
I have a twin Mercury engine Outrage 18 and I got rid of that manifold as unnecessary. The Mercury/Quicksilver water separating fuel filter (now the model for most after market brands also) has two outlets and with more than adequate fuel flow for two engines, so the manifold is not necessary.
My guess is that the old Whaler design was based on a predominance of OMC and Yamaha powered boats, whose fuel filters of the day only had one outlet, so two filters were needed for twins, hence the need for the manifold.
When I installed replacement 3/8" A-1 class holse from the tank, I ran it directly to the filter under the gunwales (with a 90 degree inlet to the filter), and then a fuel line to each engine comes out of the filter. It works well with twin 115's or 90's.
