90hp 2003 Carb 60* looper fuel pump woes

[gotboostedvr6]

I have a 2003 Carb 60* looper that will only idle. It will not throttle up without stalling. Fuel bulb stays pretty firm and fuel supply to motor is unobstructed. I drained fuel from the tank via siphon and flow was good. Carb throats and bowls are cracked. I was able to find new bowls but no new carbs are available. Every used carb i find is also cracked.

Compression is 118 to 120. Spark is strong. I suspect one of the fuel pumps has failed. Id like to completely do away with the VRO/secondary fuel pump and Vapor separator and just use an electric pump. Would it be possible to do this?

[gotboostedvr6]

Any input before I start my conversion to electric pump?

[baja200merk]

If the fuel pump was the problem it would run while your pumping the ball. Did you put the main jets back in the new bowls?

[gotboostedvr6]

I will confirm now but I'm pretty sure I did.

What does the small diaphragm pump do above the vst?

Is the VST really needed on this motor? I've never seen a vst on a carb motor..

[baja200merk]

Someone smarter than me put it on there :leaving:

[racer]

That is the vapor pump. Had one leaking a couple weeks ago but that generally creates a idle issue. Check all butterflies are opening and jetting is correct.

[mn808gade]

racer-why can't the vro be gutted and a regulated electric pump be installed?

[racer]

You can remove the VST, vro and replumb for an electric pump

[gotboostedvr6]

I fixed my motor by a combination of replacing fuel lines, vent hose, bulb, intake and carb gaskets, and the VRO fuel pump diaphragm. I cleaned the cracks with pure acetone, filled the cracks with regular jb weld, removed any excess adhesive a let them cure 24 hours. My motor never ran better.