The light for the glow plug to warm up does not even light. Both tanks are full of fuel. The last time this happened I was told a mechanic just had to pump the primer on it. I can’t find the primer pump and this might not even be what it it. Do not now the engine size. This is my brothers vehicle that is why information is so limited. Thanks for all help.
It turned out to be the ECM fuse. Thanks for the help anyway