Hi i have a 2000 johnson 150 vro it had not been started for a while started it up and it fired straight away but was not pumping water i didnt notice right away and as soon as i did when i had a look at the water pressure gauge it was not reading at all would this just be a impella problem or could there be another cause for it and if its the impella is there any tricks to fixin this have done a 1989 evenrude 150 before is it the same ??? thanks