Need help please. In las vegas - since 110 + heat my 1988 240 Volvo w 200 k + miles has hesitated and stalled and will not idle and no power. Let it sit for 30 minutes it runs - then runs well. Drive it for an hour in heat and it stalls in traffic. Replaced fuel pump relay, plugs, wires and coil. Nearly new dist cap. Thinking main fuel pump that is in line might be culprit but these guys are very reliable. Any advice will be highly appreciated. thanks.

 

look for sprak and listen for fuel pumps operating.

 

Check your in-tank pump for operation. If it's working, I would check the fuel pressure regulator vacuum hose for leaks and test the regulator itself by testing fuel pressure. Also, in that kind of heat it's pretty crucial to keep a good amount of fuel in the tank in order to cool the fuel pumps. With a low a fuel level, the pumps get overly hot.

 

hello brick wall! how are you today? fine? fantastic!

 

HEY REVOLV ! leave us kids alone !

 

This from 5+ yrs ago! I hope the OP is not still waiting on the side of the road for advice...