engine miss after installing vro to pre-mix pump

[ddyk]

I have a 98 200 hp johnson that i replaced the vro pump with a stand alone fuel pump. After installing the pump i now have a very noticeable miss at all speeds. This is with the muffs on so i'm reluctant to take it to the lake. I have no idea what I may have done during the install, the bulb pumps up fine, so are there any ideas out there what i need to look at? Any help will be greatly appreciated!

 

[racerone]

Part # of the pump you installed.----Sourced through a dealer or somewhere else ?

 

[ddyk]

Part # of the pump you installed.----Sourced through a dealer or somewhere else ?

i got it from mastertech part # mtm-06 200 fuel pump kit

 

[racerone]

It could be that there is an issue with crankcase compression.----It is the PRESSURE that drives these pumps.-----How did motor behave with the VRO pump ?----Did you find something wrong with old pump ?

 

[ddyk]

It could be that there is an issue with crankcase compression.----It is the PRESSURE that drives these pumps.-----How did motor behave with the VRO pump ?----Did you find something wrong with old pump ?

It ran fine before other than it was trying to run out of gas ( i had to keep priming the bulb for it to stay running) It didn't have this type of miss before. I haven't had a chance to look at the old pump yet.

 

[flyingscott]

Did you remove the pulse limiter? VST pump working

 

[racerone]

Is there a VST on this motor ???

 

[flyingscott]

Is there a VST on this motor ???

Thats why I asked. Are you good with that? Feelings not hurt to bad?

 

[ddyk]

Did you remove the pulse limiter? VST pump working

the pulse limiter was removed and installed the brass fitting that came with the pump kit, but i don't know what a vst is

 

[racerone]

Vapor separating tank------Your motor does not have that item !

 

[ddyk]

Vapor separating tank------Your motor does not have that item !

Thanks for that! I'm still at a loss as to what is causing the miss though

 

[racerone]

Carburetor bowls warped ?

 

[Chris1956]

My '98 Johnny 150HPV6 has an intermediate orifice on the carb or throttle body. They are open to the air. Give it a blast of spray solvent and see if that works. It is a brass tube under the air box.

 

[ddyk]

My '98 Johnny 150HPV6 has an intermediate orifice on the carb or throttle body. They are open to the air. Give it a blast of spray solvent and see if that works. It is a brass tube under the air box.

ill give that a try, thanks

 

[ddyk]

Carburetor bowls warped ?

maybe, but it started to miss after i installed the fuel pump, thanks , ill take a look though

 

[racerone]

Then get rid of that fuel pump.-----Sounds like it is clearly the issue !

 

[ddyk]

Then get rid of that fuel pump.-----Sounds like it is clearly the issue !

well hell!!