Hello all... I'm new to the site...
I have the 40th anniversary Bass Tracker. I'm the original owner. The engine has 23.9 hours. The engine stalled and I had a long audible alarm the last time out. Engine turns over but will not run. I can't feel the electric fuel pump inside the vst running with the key on. Fuse checked out and is good. Returned to dealer and their diagnostic report showed a bad vst.... which is no longer under warranty and well over $1100.00 plus labor for them to install. I chose to bring the boat back home and do a little investigating on my own.... the vst has a two wire plug going into it... I verified that I have power going to the vst, I removed the fuel pump from the vst and it is clean with no debris restricting the impeller, I bench tested the pump with jumper wires to a battery and it runs like new, I reinstalled it on the engine and it doesn't run, I still have the long audible alarm with the key in the on position.... How could it run on the bench but not on the engine?.... I have 12v at the plug going into the vst on one of the wires but I do not have continuity between the other wire and a ground source. Contacted Mercury for a pinout diagram for the computer bulkhead and found that the "ground" wire for the pump returns directly to the computer on the engine... I tested the "ground" wire for continuity from the bulkhead pin to the plug that goes into the vst... the wire is good... possibly a bad computer was my thought... I replaced the computer and still have the same issue.... I ordered a new vst fuel pump but haven't installed it yet.... I tested continuity between the terminals on both the old and the new fuel pumps... the old pump reads 9 ohms of resistance and the new pump reads 3 ohms of resistance.... Could this difference in resistance be causing the pump not to run on the engine although it runs just fine when I hook it straight to a battery?
I'm scratching my head with this one... Anyone else ran into this before?
Thanks in advance to all
I have the 40th anniversary Bass Tracker. I'm the original owner. The engine has 23.9 hours. The engine stalled and I had a long audible alarm the last time out. Engine turns over but will not run. I can't feel the electric fuel pump inside the vst running with the key on. Fuse checked out and is good. Returned to dealer and their diagnostic report showed a bad vst.... which is no longer under warranty and well over $1100.00 plus labor for them to install. I chose to bring the boat back home and do a little investigating on my own.... the vst has a two wire plug going into it... I verified that I have power going to the vst, I removed the fuel pump from the vst and it is clean with no debris restricting the impeller, I bench tested the pump with jumper wires to a battery and it runs like new, I reinstalled it on the engine and it doesn't run, I still have the long audible alarm with the key in the on position.... How could it run on the bench but not on the engine?.... I have 12v at the plug going into the vst on one of the wires but I do not have continuity between the other wire and a ground source. Contacted Mercury for a pinout diagram for the computer bulkhead and found that the "ground" wire for the pump returns directly to the computer on the engine... I tested the "ground" wire for continuity from the bulkhead pin to the plug that goes into the vst... the wire is good... possibly a bad computer was my thought... I replaced the computer and still have the same issue.... I ordered a new vst fuel pump but haven't installed it yet.... I tested continuity between the terminals on both the old and the new fuel pumps... the old pump reads 9 ohms of resistance and the new pump reads 3 ohms of resistance.... Could this difference in resistance be causing the pump not to run on the engine although it runs just fine when I hook it straight to a battery?
I'm scratching my head with this one... Anyone else ran into this before?
Thanks in advance to all
