Turns out after putting everything together the lever for the Res tank was on upside down so when in the On position it was actually using the Res thats why it would shut off, Everything seems to be fixed now.
I could be wrong on this ?, but..from what little I know about the selector knobs on fuel tanks, if you installed the knob facing the wrong way, so it was set to reserve instead of on ?, this should only make a difference when running. what I mean is, if you set the knob to reserve, when you thought it was on ?, all you would do is run out of fuel, because you would never get to a point where it would shut off, then switch it over to reserve to get it running again. have I lost you yet ??. now..if you installed the lever to go from on to off ?, then yeah..would make sense. the only difference between reserve and on is that you would never get to that point where you would be going along, it ran out of gas, and you switch it over to reserve to keep going, in other words, no reserve, because you ran it out of fuel because you were always in reserve position. I hope this makes sense to ya ?