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  #1  
Old 07-04-2014, 01:58 PM
Paul Edwards Paul Edwards is offline
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Power to fuel pump

My fuel pump is not getting power consistently. Intermittently it will charge and the boat will start but I haven't been able to identify the location of the problem. It's a new fuel pump. Any suggestions?
Thanks, Paul
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  #2  
Old 07-04-2014, 02:14 PM
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sand2snow22 sand2snow22 is offline
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Make sure connection at the pump is tight, make sure all the pins are connecting tight!
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Old 07-04-2014, 03:14 PM
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mikeg205 mikeg205 is offline
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Hopefully you have a good fuel pump. could be a faulty fuel relay IMO - additionally check voltage at fuel pump when starting - especially when it fails
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Old 07-06-2014, 04:04 PM
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bturner2 bturner2 is offline
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Connection or bad relay would be my first thoughts.
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  #5  
Old 07-07-2014, 08:48 AM
curver900 curver900 is online now
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Don't be afraid to chase wires.. I had to... and a voltmeter is a must....
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Old 07-07-2014, 08:50 AM
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mikeg205 mikeg205 is offline
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Quote:
Originally Posted by curver900 View Post
Don't be afraid to chase wires.. I had to... and a voltmeter is a must....
voltmeter and prop puller 2 of the must have tools for MC owners...
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  #7  
Old 07-07-2014, 09:40 AM
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JimN JimN is offline
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Quote:
Originally Posted by Paul Edwards View Post
My fuel pump is not getting power consistently. Intermittently it will charge and the boat will start but I haven't been able to identify the location of the problem. It's a new fuel pump. Any suggestions?
Thanks, Paul
Depending on the pump, some have a known problem with the power plug and the terminal becomes hot, melts the plastic and loses contact. Look at the plug on the old pump and the harness- if you see evidence of heat, like melted plastic, replace the end of the harness- most auto parts stores sell this fro less than $20. If it doesn't come with Heat N Seal butt splices, buy some- preferably the kind with solder inside, which melts when a heat gun makes it hot enough for the heat shrink tubing to do it's job- it shouldn't ever get that hot in normal use.

IF THAT ISN'T THE PROBLEM,

Check the fuel pump fuse and if it looks like it got wet, clean the fuse holder and replace the fuse.

If the fuse and holder are clean, check the relay and socket- if they're clean, put some dielectric grease on the terminals and check the relay- connect tabs 85 and 86 to the battery and a good ground, with a test light (NOT the LED type) connected to tabs 30 and 87. You shouldn't see a connection when it's at rest, but every time the relay latches, you should see a good connection from 30 to 87, shown as a bright light. If it's dim, replace the relay or try another ground.

If the fuse and relay are good, connect a meter from the relay socket's pink wire to the pink wire at the pump- you should read 0 Ohms, maybe .1 Ohms, but no more. If it's higher, check the terminals. Clean the terminals and apply dielectric grease.

If this has checked good, measure from the pump's ground wire to the battery negative, not the block. If you see significant resistance (more than about .2 Ohms), find out why. Follow the harness and find where it attaches to ground and inspect that.
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  #8  
Old 07-07-2014, 09:52 AM
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soacj soacj is online now
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Just replaced a probably good fuel pump Friday courtesy of not checking the connector. I found one in stock locally.

This is the kind of thing that makes JimN shake his head.
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  #9  
Old 07-07-2014, 10:10 AM
curver900 curver900 is online now
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well now you have a spare...
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