Fuel flow issues

[Flygaff]

I have twin 135 optis on a 25 center. The problem.

My primer balls suck down and shut down the engines. The set up.
200 gallon tank going to two 90 GPH racor filters going to two flow scan sensors to the balls to the engines.what I have done so far. Pumped tank out and removed some water. No help. Changed filters. No help. Bypassed flow scans. No help. Changed balls and ALL fuel lines. No help. Changed vent hose. No help.
The problem occurs after I run a little while. I ran out to the old FG bout today. No problem until I was almost back. Same thing last week, after awhile it will just close down. Any ideas? I am at a loss. I know it is somewhere on the fuel side. Maybe there is something floating around in the tank that I can't find???.

Help

[Flygaff]

I also removed the check valves and pickup screens. No help

[Gerry Zagorski]

Sounds like you looked at all the places I would have. Are you sure you changed all the fuel lines? Reason I ask is I had a friend who had the same issue. After spending lots of time and money replacing things, it turned out to be very small section of fuel line hose they didnt replace that was collapsing on them.

Sounds like both motors are having the same issue, right? If so it would seem to me that it has to be something between the tank and where the fuel line splits to feed both motors. This is where would start looking around. You could try to run the engines on portable tank at different locations of your fuel system to try and narrow down your search. Maybe start by disconnecting the fuel line from your tank, run that line directly to your portable tank, run the boat and if it checks out OK then you know it's something having to do with the tank, vent, check valve etc. If it does the same thing then it has to be something upline of the tank and you'd work you way upline bypassing other components that are inline heading towards the engines.

Best of luck Fly.... Let us know what you find.

[Flygaff]

Is there anyone around that can pump out and CLEAN a fuel tank?

[Gerry Zagorski]

I have not used them before but check out their ad on Craig's list

http://cnj.craigslist.org/bod/3870291199.html

[Flygaff]

I found someone. I have to haul the boat tomorrow. He will filter all the fuel and pressure wash the tank I.D. I will have it back Friday hopefully with all issues resolved.

[Bass_Appeal]

Originally Posted by Flygaff

I also removed the check valves and pickup screens. No help

check your fuel vent , or cap if it cant get air in its like a balloon or bag after sucking the air out it collapes in till you cant get any more air out , which creates a vacumm hold ,