I really dont know, ive never done the test before. Im sure albert will know tho. That low on the pump seems pretty bad. hopefully you dont need a new one.
I looked for you also roger, didnt find what i wanted. I thought you could plug a gauge up, right by the pulleys there was a brass fitting with a black cap covering it.
Are you having fuel issues, or just checking the truck over thoroughly?
-michael
I really like the standyne additive. But just cheap 2 stroke works good as well, probably just as good as anything else. Anything to get some lubricity in this dryer fuel.
Have you replaced the speed sensor? Input or output sensor? A friend was having a kind of similar issue, we went over all connections with electric grease and the problem never came back.