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Engine stalling

I have an engine problem which started immediately after the VRO was disconnected. I am wondering of the mechanic who did it missed something and having read various threads there are two issues I am wondering about.

First of all the problem I have is that the engine will cut out after the engine has been running for anything between 4 and 10 minutes (and I am therefore of the opinion it is not the fuel pump itself). I have a glass inline fuel filter just before the fuel pump and when primed it is full but slowly the fuel filter will emply out (is the pump not stong enough?). Therefore I assumed it was a fuel starvation problem. I have checked everything from the tank to the engine including changing the fuel/water seperator and bypassing the primer bulb and I did notice an improvement in the length of time the fuel filter stayed full but it is slowly draining away.

Therefore I am wondering if there is something in the engine which is causing the problem. Having read other threads there are two questions.

The first is the wires from the VRO pump were not disconnected (my engine has three wired). However I disconnected it and the problem still exists. What does disconnecting the wires do?

The second is capping the oil input on the VRO. The mechanic capped the oil pipe from the oil resevoir but did not capp it at the vro pump. However when I put my finger over the end there is no difference. Should I still put a small length of fuel hose on and cap it properly.

Any further suggestions?
 
Yes, you should cap off the oil inlet at the VRO pump (otherwise it would be sucking air). You should also disconnect the wires from the VRO pump wiring harness. They are for the warning horn. If you've been running the engine with them hooked up you should have heard the warning horn.
 
I am assuming this is all at idle speed.
You fill the bowls up with the primer bulb, and a weak (or dead) fuel pump cannot refill the bowls...engine runs out of gas. Usually takes about 5 mins at idle.

Prove it out by by pumping the primer bulb (replacing the fuel pump action with manual action). I have seen that many times...and sometimes it is the torx screws holding the diaphragm covers on the fuel pump front and back. Tighten those torx head screws evenly, 1/8 turn past the point of contact with the plastic fuel pump body. Air leak there will cause weak or no output.
 
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