Primer bulb issue

[Jakem]

I am having an issue with fuel supply to my 250 two stroke. I have replaced the fuel lines, primer bulbs, and the issue is the bulb pumps up hard but looses it's pressure. Also the same happens to my kicker line. Any suggestions

 

[Scott Danforth]

Check the carb needle and seat

 

[Jakem]

It's a new to me boat and I'm sure it needs a good engine once over

 

[racerone]

When motor is running the bulb does not need to be hard.

 

[Jakem]

Seems when just trolling it chugs so I figured the primer bulb was issue. Runs smooth in nuetral however has a chug when going slow

 

[racerone]

Perhaps running lean on slow speed mixture?----Year / model # is ?---Carbureted or fuel injected ?

 

[Jakem]

1994 yamaha sea pro 2...fuel injection,

 

[racerone]

Looked at parts for 1994 models.----The 4 that I see list carburetors.-----Your model number is ?

 

[boscoe99]

All primer balls will get softer once the motor is running. The fuel pump(s) lower the fuel pressure within the fuel system from the pump inlet all the way back to the tank.

 

[boscoe99]

If and when the motor seems to not be running right pump the primer ball to force gasoline to the motor. You doing with the ball what the fuel pump should be doing. Does the motor seem to run better when you do this?

 

[boscoe99]

Is the model of the motor not known?

Is it a Yamaha or a Suzuki?

MMM. Motor Models Matter.

 

[Jakem]

It's a yamaha l250...TXRS....yes when I pump it up it runs better

 

[racerone]

It is shown with carburetors.----A new to you boat you say.----Do a compression test on this 30 year old motor.----Post the actual values here.

 

[Jakem]

This is what I got

 

[racerone]

Perhaps the wrong cowling.----Post 5 or 6 pictures of the powerhead.

 

[boscoe99]

Or perhaps a fuel injected model has been mounted on the frame of a motor that had carburetors.

 

[Jakem]

Definitely has carbs

 

[99yam40]

if pumping the bulb helps, I would be looking at the 3 fuel pumps

 

[Jakem]

The bottom fuel pump continuously clicks as soon as I put power on. Also noticed that my air boxes are missing the o rings

 

[racerone]

No surprise.----See post #6.-----And I do not believe the fuel pumps are electrically operated.