boaterjoejoe
Cadet
- Joined
- Jun 29, 2010
- Messages
- 9
Hi,
I am setting up a 1990 vx250hp (extd)2 stroke Yamaha micro computer ignition and need help with fuel starvation diagnosis please.
While running on the water hose, it pops and fires quickly with a light choke and no idol rev, but soon starves out and dies after 5-10 seconds, however?the electric fuel pump continues to rattle away until I turn the key off.
Here is what I know so far:
-choke clicks on and off.
-Compression is good, spark is good, and plugs are good.
-I am running it on a new clean external gas tank, hard squeeze bulb, new gas, and the oil reservoir pumped itself full.
-The 3 main (unpowered) fuel pumps are new this month.
-When facing the carburetor end of the motor, the top left and middle left carbs are drying out, compared to the other 4 which show a little bit of fuel wetness at the bottom of the main butterfly. These two carbs are the furthest away from the unpowered fuel pumps and are dry.
-With the unpowered fuel pump lines disconnected at the carb, the squeeze bulb pushes out gas for all carbs.
-I have removed the float bowls and all floats/needles are moving freely, bowls were not overly dirty inside.
-With the main output line removed, the electric fuel pump pushes fuel 1-2 inches in the air.
-Not all the unpowered fuel lines have zip ties securing them.
Questions:
Is the electric fuel pump bad, or do I need to fix something else to get it to pressurize and shut down?
What do I need to do to restore fuel flow to the top left and middle left carbs?
How can I test/know if the oil injection is actually working?
Any suggestions on what to trouble shoot / rule out next?
Thanks for the help!
Joe
I am setting up a 1990 vx250hp (extd)2 stroke Yamaha micro computer ignition and need help with fuel starvation diagnosis please.
While running on the water hose, it pops and fires quickly with a light choke and no idol rev, but soon starves out and dies after 5-10 seconds, however?the electric fuel pump continues to rattle away until I turn the key off.
Here is what I know so far:
-choke clicks on and off.
-Compression is good, spark is good, and plugs are good.
-I am running it on a new clean external gas tank, hard squeeze bulb, new gas, and the oil reservoir pumped itself full.
-The 3 main (unpowered) fuel pumps are new this month.
-When facing the carburetor end of the motor, the top left and middle left carbs are drying out, compared to the other 4 which show a little bit of fuel wetness at the bottom of the main butterfly. These two carbs are the furthest away from the unpowered fuel pumps and are dry.
-With the unpowered fuel pump lines disconnected at the carb, the squeeze bulb pushes out gas for all carbs.
-I have removed the float bowls and all floats/needles are moving freely, bowls were not overly dirty inside.
-With the main output line removed, the electric fuel pump pushes fuel 1-2 inches in the air.
-Not all the unpowered fuel lines have zip ties securing them.
Questions:
Is the electric fuel pump bad, or do I need to fix something else to get it to pressurize and shut down?
What do I need to do to restore fuel flow to the top left and middle left carbs?
How can I test/know if the oil injection is actually working?
Any suggestions on what to trouble shoot / rule out next?
Thanks for the help!
Joe