My fuel pump went out on my 8 at 60,749 miles. The pump worked fine on short drives but would have problems on longer highway trips. The symptoms it presented after driving for awhile were rough acceleration when applying the throttle and the pump would cut off frequently. I'm assuming due to heat. I took it to the dealership and after several days and many tests they finally confirmed there was a loss in pressure once the pump warmed up and replaced it.

I'm starting to have a problem now that's exhibiting the same symptoms as before. I have 63,000 miles on my 8 now. I replaced the plugs and coils at the same time my new fuel pump was installed. They also tested my compression when they replaced the old pump and all of my numbers were good. Is there an easy way I can monitor fuel pressure while I'm driving to determine if the new pump is bad? Since she runs fine during city driving and doesn't act up until after an hour or so on the highway I don't want to engage the dealership yet. Is this something that the scangauge or something else can do?

Any ideas or opinions anyone can provide would be greatly appreciated. I have a few out of town trips planned next month and I'm scared I may get stranded like the last time the pump went out.

EDIT: No CEL is being thrown.

 

The fuel pump resistor is what is actually overheating.
Its a $75 part and can be replaced easily. Its in the engine bay near the air pump.

Because of its proximity to the exhaust system, it gets cooked.
It should be replaced at the same time as the pump.

 

Thanks MM.

I'll check my receipt to see if the dealer replaced that when they replaced the pump. I'm pretty sure they didn't.

 

FWIW,

I just got off the phone with Tom and http://www.partsgroup.com and he said they've blown a few engines due to this part failing while under load at the track. I wonder if there's a good way to relocate it or provide some type of heat shielding from the exhaust.

 

Yes.
I moved mine to a different spot on the fender and mounted it on a solid aluminum bracket that shields it and faces it away from the manifold.