vro fuel side issues

[travism913]

e200stlccm

was running some test in a tank on saturday. notice fuel filter was not filling all the way. when tilting the filter on its side you could see fuel dribbling through then a burst followed by no fuel for a second. i remove primer bulb and still same thing. remove tank selector and same thing. removed tank selector and hooked directly to tank and same thing. tanks were just cleaned and everything replaced. no anti siphon valve and no air leaks on line or tank. could this be more so a pump issue or pulse limiter

[kingsbiship]

Are you fuel starved or running poorly? You didn't say! If there is no problem... don't create one!
New filters will have less in them, the old ones will be full due to restriction.

[travism913]

It struggles to plane out and seeing the filter empty for a min and then dribble some then a short burst kinda worries me a bit. even after raising rpms it will act the same way

[kingsbiship]

When the eng. is acting up... pump the primer ball and see if this cures your problem.

[perfmarine1]

Have you checked the pulse line from block to fuel pump? I have seen many plastic clamps break. Also what is fuel pressure between fuel pump and carbs,that is what matters.VRO Pulse pump will show suction side pulsing. I am not a big fan of VRO pumps,would go with electric pump system.

[travism913]

The line and clamps are new from the pulse limiter to the vro. i was kinda looking for that answer about the suction from the tank pulsing with the pump. i am a auto mechanic and this is a totally different monster to me. i still need to t in my fuel pressure gauge to the pressure side of the pump and monitor that. what electric fuel system would be safe i worry about that due to rpm dependent pressure and volume. with a cylinder pulsed pump you would have less volume at idle than you would at say 6000rpm due to the pump actuating from a lot more crank case pulses. i would think with electric that is constant pressure and volume and may cause the needles to unseat and causing a flooding condition.

[perfmarine1]

Never had a flooding problem with electric pumps,been running them since the early 80's. You can run them through the VRO pump or remove it and run it alone. VRO pumps are fine for pleasure boats,but performance boats and race boats need constant volume.

[travism913]

So you think i should use a electric as more of a lift pump to the vro to know thag i always have the volume? what electric pump are you using?

[perfmarine1]

I Run the Mallory 110 marine pump. It is slightly adjustable on the pump,at 6psi. With a water separating fuel filter before the pump. 1 thing to remember,elect pumps push better than they pull so mount filter and pump low and close to the tank. I also run a fuel pressure gauge in the dash so I can monitor fuel pressure all the time,a big piston saver. And you don't need a primer bulb then,either.

[travism913]

Well what about using one as a lift pump to the vro?

[frederick55]

The Carter 4594 6-8 psi with a fuel regulator and gauge is perfect for your looper. Ran one on a stock 225 with no problems. Got rid of the VRO and pre-mixed. If the VRO has a leak you can still be sucking air. Not good. The Carter lifts just fine when primed.
http://www.summitracing.com/parts/crt-p4594