1990 force 90 2 stroke using WAAAY to much fuel

[tallboymo]

Trying to breath life into my old 90 force. Took the carbs off and cleaned them all out. It was not running before I did that. Now it will start and run but used 2 gal of fuel in 10 minutes! The bulb will not get and stay hard, but I don't know where the fuel is going when I pump it. I put a clear inline fuel filter on and can see the fuel gushing through it. Any ideas on where to start looking would be appreciated.

 

[Nordin]

Check the fuel pump diaphragm.
If it is worn and have holes or is ripped, fuel will go direct into the crank case.

 

[Sea Rider]

it will start and run but used 2 gal of fuel in 10 minutes! The bulb will not get and stay hard

Was combo running lightly, medium or fully loaded at which throttle range ? Does the motor loses performance as if working with less fuel when at 3/4 to full throttle ? The bulb once primed till firm won't remain same when motor is in operation, plainly normal...

Happy Boating

 

[jerryjerry05]

Sea Rider, he said it wouldn't get hard at all.
If the bulb won't get or stay hard?
Then the diaphragm in the pump or the squeezie is bad.
Even a NEW squeezie can be bad. Had 3 Tempo squeezie's bad right out of the box.
Your right about the ball won't stay hard after starting.
It's only job is to draw fuel from the tank and pressurize/fill the system.
After start it just sets there.

Even running at 3/4 throttle it shouldn't use 2 gal. in 10 min.

 

[Sea Rider]

OK, If fuel pump diaphragm is in excellent shape, personally would test combo as usually loaded on a wot run on flat, calm water cond to check max revs said motor achieves. Compare it with the min-max manufacturers wot rpm range to see if inside its rpm range, running any motor badly propped will guzzle more fuel in the 3/4 to full hammer down range compared to same motor correctly propped for that application. A wot run will determine so..

For best fuel consumption, motor should be running at least middle to max wot rpm range as usually loaded, if with a fixed load much better. Once there can throttle at your preferred rpm range.

Other point to consider is that it's a medium large 2 stroke motor, those guzzles 13-14 gallons per hour running full hammer down. OP has not posted at which throttle range and rpm motor was running at. You won't see the usual 10% fuel consumption per HP/hour many boaters goes by not even on new 2 strokes motors...

Happy Boating