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Now that our gubbermint is mandating all this gas saturated with alkeyhaul,,, the innner liner of older fuel lines breakdown and collapse. It also breaks down and allows liner particulates to stop up filter,injectors etc.... alcohol and older stayle fuel lines don't mix.

There are replacement hoses that are alcohol tolerant, and spendy too.... ! I buy mine from Jegs or Summit racing.

R

Thanks ya'll. Wondering if the type of water seperator filter matters? Put on a 10 macron. Maybe not compatible with an older engine?

is that a stock seperator? 10 micron is a pretty fine filter for a carb motor,,(IF your's is carb), I run 10 mic on my Merc EFI's, but those have a serious electric push type fuel pumps on them, plenty of pressure and the 10 mic filters protect the injectors.. Typically the carb motors will have a diaphram fuel pump mounted on the block, can be found by following the fuel line from tank to motor. Those diaphram pumps have a thin rubber diaphram that will wear out, get holes or tears in them that require changing just the rubber diaphram. Easy to do.

Had you recently changed the fiter , then began to have the problem ?

R

Yes, basically. My son (its his boat) said it was starting to run rough. so we did the typical stuff-plugs, fuel filters, new fuel lines etc. Should have left it alone! LOL. Anyway, everything seems to be clear from the filter to the tank. The fuel line is brand new- could the new filter possibly be TOO restrictive??
THANKS!!

It could be a combination of a too restrictive filter and a weak diaphram pump, with the pump not being able to 'pull' thru the filter. You may be able to remove the filter element altogether and see if the motor runs any better.The diaphram pumps operate off the motors vacumm while running. Typically the little diaphram pump is a small 1.5 inch square dillywigg that attaches to the front half side of the block. Its held in place with 2 or 4 screws. The pump can be easily removed or you may even be able to open it up to inspect the rubber diaphram element with it still in place. they are cheap enough to replace for good measures anyway, and you'd rule out that particular item as a bad actor.

R

git her fixed yet?
R

Thanks, but not yet. Got real busy with work. Gonna try and by pass the water seperator which I had put on a different type (10 macron ?) Thinking it my be too restrictive. Going to bring a little 3 gallon tank just incase, so I don't get stranded. Just can't figure what else it would be.
Thanks for the inquirey. If that isn't it, I'll try hiring someone who is a bad a$$ trouble shooter and who will come out to the house and work on it, being I live on the water.

okay, I went through it again, checked fitting and tube on the tank where the fuel line connects, and rechecked vent hose from the tank to the side of boat. Rechecked all fuel lines from the bulb to the carbs. By-passed the water seperator . STILL sucking primer bulb flat after about 20-30 minutes of good running (3500-4500 rpms). brought
a little portable tank this go round and it ran great until tank went dry!!!
LOL, totally stumped and have a mechanic lined up tis week to check it out. I'm assuming something simple that I am over looking? Will have him rebuild the carbs and install new diaphram pump while here...

check the arrows on the primer bulb make sure it is not installed backwards. If the bulb is staying sucked down it is an air issue for sure. mud dobbers will do it to you. blow air through your lines with a air compressor. but check the arrows on the bulb first. LOL. good luck

check make sure you fuel tank vent is open,,,cheers

I see you mention a welded fitting so I assume it may be a aluminum tank.

Sounds like you covered quite a bit as far as trouble shooting goes. The fact that iot ran good on the portable tank leads me to belive you may have a stoppage in the pickup on the main tank.

I helped a friend once who had his pickup tube smashed into the bottom of his tank by dropping something on the tank hard enought to permently push in the tank where the pickup was located, The pickup was mashed so bad it would not allow hardly any suction.

You may have something similar,, or even trash may have accumulated around the pick up tube screen, cloggin it up...

You have the problem isolated to tank only now.... trail and error sucks, but ya almost got it I think...
R