1988 115 Inline 6 Fuel Pump

gestun

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May 5, 2025
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I have a 1988 Mercury 115 I6 that I am working on. The previous owner was having fuel delivery issues and attempted to replace the fuel pump with a cheap ebay aftermarket. That pump failed and he went with an electric pump which he never got working correctly. I am ditching the electric pump and have obtained an appropriate Quicksilver pump. My problem is that in removing the old mechanical pump the previous owner also removed and discarded the Fuel pump mounting plate. The plate (part numbers 14439 or 14439A2) appears to be unobtainable as a new part, I am also not able to find the gasket. I am seeking suggestions on how to get around this. Here is what I am considering:
  • Finding a used part. I have done a brief search and found a few placed that i intend to email, but I feel like this is a bit of a longshot
  • Tap the holes directly on the block and install fittings. I feel like this will work as long as i don't screw up the tapping.
  • I have found a listing for the base plate (used) to the old style fuel pump, which mounted directly to the block using the same holes as the new style pump's mounting plate. I am considering buying this and tapping it rather than the block and just making my own gasket. (Photo of this attached)
I am open to any suggestions/feedback you can provide. I have also attached the fuel system diagram and a picture of the mountain location on my block for reference. Thanks in advance.
 

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Chris1956

Supreme Mariner
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Mar 25, 2004
Messages
28,108
The Crowleymarine web site shows a figure 8 pump style for that IL6 serial number. It is roughly the shape of the old baseplate.

Here is what it looks like.


You might look for a used one.
 

gestun

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May 5, 2025
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Interesting. I bought the square style pump from a Mercury dealer after giving them my serial number.
 

gestun

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May 5, 2025
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According to the story I got from the previous owner, yes original power head. The guy I bought it from was the grandson of the original owner. Is there a SN stamped on the block somewhere so that I can confirm?
 
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