My 87 300TDT has began to be hard to start after it has warmed up on a warm day here in FL. Has left my wife stranded 2 times. After it cools off overnight it starts right up and runs fine. I am thinking that it is the Injection pump shut off valve- The IP was replaced by Mercedes about 2 years back and they did not replace the shut off valve. Could some one describe what happens when this valve begins to be intermittent or fail?
Many thanks,
David