Hello I have an 89' e350 motorhome with the 460 it stalls after driving for a while. It sputters and stalls out after a half hour or so it usually fires right up like nothing ever happened. I check power at the rear tank and I have no voltage going to the fuel pumps. Last time it happened I put a new relay and it didn't seem to help it just fired up after the half hour just as it normally does. I've also done the intank pump and filter. So what's causing it to loose power?

 

Hi Danny,
Since the stall is so predictable (about a half hour), you have the choice of starting at the fuel pump relay and connect a meter there that will show power when the vehicle is running then watch it for the half hour and see if the power ever quit there, or not ,when it stalled. If the power was never interrupted there, you would move on to the tank switching switch if it has one, and confirm if power is always available there. You need to move down the line until you get to the point where you can actually see the loss of power and check that area out. To suggest replacing anything without confirming the condition is shooting in the dark.