Re: MP 350 blowing fuel pump fuse
Here is what is happening. My original batteries were old (about 12 years old, always on a battery trickle charger when not in use), so they were not putting out enough volts/amps. when the batteries were run down, the fuel pump fuse would blow. I put a 20 amp battery charger on it and while charging, i would turn the key and both fuel pumps would cycle and the engine would turn over and start. With out the charger on the batteries, the fuse would blow. So, I replaced one Odyssey battery (the only type that will fit the tiny battery compartment) with a new one (I will replace the other one soon). The new battery has a manufacture date of 7/11. I installed it, turned the key, and the fuel pumps would cycle and the engine would start. I did this a few times in my garage to make sure the new battery fixed my problem. after the 4th or 5th time I started the engine the fuse started to blow again. Remember the battery was sitting on the the shelf at the store for about a year so it wasn't fully charged. So on the 20 amp charger it went. Now fully charged, turn the key, fuel pumps cycle and engine starts.
So I believe my old worn out high pressure fuel pump blows a fuse when not enough current from my battery is available. Looks like I will be replacing my high pressure fuel pump ($350), low pressure fuel pump ($110) and another Odyssey battery ($212). Not too bad considering that this is my only failure in about 800 engine hours.
Thanks for everyone's input.