accessing trailcraft fuel tank
i have a problem with my 5.3 m trailcraft cc. I have a 115 yamaha 2 st fitted that has just started losing power when i increase the revs. this is a frustrating problem as it occurred previously so i took the boat to a yamaha tech who could find nothing wrong with it, after running it in a tank for over an hour and suggested water may have some how got into the system. Anyway took the boat home and went on 2 more short trips doing about 20 kms with no problems, all was good until i ventured about 25 km out this weekend the motor ran fine until i stopped and attempted to move spots when the symptoms returned. Starts fine put it in gear give it some curry and the power just fades after a while it would slowly build up power and seem to run fine until i backed it off and when i give it revs again same thing. If i rev it in neutral it revs out no problem but soon as i put it in gear power fade. We got home and when i flush her she idles real rough and splutters out i had another tinker today put the muffs on and she seemed to idle perfect. Online research and the symptoms have led me to believe that there may be some crap circulating in the fuel tank after prolonged usage this craps is getting stuck around the fuel intake inhibiting fuel flow and loss of power after a period of no use this shit falls off and the motor runs fine again for a period, this seems to explain why short trips are no problem but longer trips are. I should mention the fuel filter had about 40to 50 mls of what looked liike gunk in it (could be water) below the petrol when i emptied it into a clear jar. Is this normal? Any way gonna borrow a portable fuel tank off the mehanic on wednesday and go for a run to see if this narrows down the problem.
My probem is, if it is crap in the tank or even deteriorated fuel lines how do i access the tank. THe boat is second hand and the carpet has been stuck down so i cannot see where i can access the tank. The tank is directly below the seat and looking in the small viewing hole doesnt show a lot. Reading online it seems the mercury fuel hoses tha yamaha uses are very succeptible to breaking down and should be changed and alot of people have done it on the trailcrafts but i cant find info on getting to the tank. Please help