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Hi Dave, my name is ***** ***** I will be helping you today.
How old is the fuel in the tank? Was fuel pressure checked while underway? What kind of history or story is there to this boat, when was the last time the boat made full speed, and the engines full power?
Hi Dave. Was fuel pressure checked at idle, or with the boat at max speed, and the engines at max rpm?
The only true test is with the boat at max speed, anything else really doesn't matter.
How intermittent is this issue? Does it come and go every other trip?
You mentioned it was backfiring. Could you tell if it was popping in the intake manifold, or out of the exhaust?
Are you still with me?
The problem is more than likely going to be either clogged fuel filters. Or bad anti siphon valves. Anti siphon valves are check valves on the fuel tanks outlet where the fuel line connects. They look like hose barbs, but they have spring loaded check valves inside of them. Those check valves both stick, and collect debris, restricting fuel flow to the engine. When that happens the higher the rpms gets, the greater the fuel restriction, and the engine ends up starving for fuel. The fuel starvation would also cause popping in the intake manifold. Does that all make sense? If yes, did you have any further questions on the issue?
I think that should do it. But I work for tips so I do want to make sure you are happy with my service before you go. If you had a further question on the issue by all means feel free to ask. If not, Just in case you do not understand the way the website works (and some folks do not). You do have to put forth a positive rating in order for it to credit me for helping you. When ratings are not done, the website simply keeps your deposit and they will not credit me. The ratings box is located at the top of the screen. To rate, you must select the start and also confirm it. Please let me know if you run into any problems or errors when trying to do it. If you do have a problem, or if you can not see the ratings box which is at the top of the screen. Please reply back "I rate Jason's service _______" and fill in the blank.
Questions do not close out, so if you have to come back later on with follow up questions to the issue you still can even after doing a rating.
You are most welcome Dave. Good luck!