A couple of weeks ago we were on our way out, and the engine fell off from around 4500rpm to 3500.. i pulled back and idled for a few minutes, pushed it back up and ran fine all day. Next trip out an fine all trip. next trip it backed down again. I pulled the fuel hose, and it looked like plastic lined hose, and the plastic was coming off and clogging the fuel hose connector on the engine. I squeezed the bulb and put the fuel line in a bottle, and all this plastic lining was coming out, some in pretty big pieces. Ran fine for few miles, then started acting up again. When i got back I changed the fuel line out between the bulb and the connector, changed the bulb, put an inline filter in, and changed the low pressure fuel filter, it just had a little sediment in it. Took it out sunday, and it backed down again. but if you leave the throttle in the same position, the rpm will back down, and then it will surge, kinda like its starving for fuel, then getting it. If i keep it under 3k rpm, will run fine, so im wondering if it could be a clog in the high pressure side. I disconnected the high pressure hose past the pump and high pressure fuel filter, and turned the pump on, and pushed out a strong stream of fuel. Also made sure the fuel injectors are all clicking.. just seems like its starving for fuel at higher rpm, and it backs off maybe 500-1k rpm with the throttle in the same position. It does not back down to the same rpm everytime, just seems to back down 500-1k rpm from where it was running at, then it will run fine for a bit, and do it again... seems like something is being clogged to me, but not sure where else to check. There are no errors flashing on the rpm guage and no beeps. Everything was good until this fuel line deteoriation issue.
Tim
Tim