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Old 02-25-2022, 11:37 AM
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Just posting pic snd link: #16 is screen filtrr under reg /top of cooler i was referring to.
https://www.mercruiserparts.com/bam/...31904/2690/100





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Old 02-25-2022, 11:44 AM
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Originally Posted by SB
Just posting pic snd link: #16 is screen filtrr under reg /top of cooler i was referring to.
https://www.mercruiserparts.com/bam/...31904/2690/100


Yup thanks. Gonna disassemble that after work and check it out.
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Old 02-25-2022, 01:07 PM
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Originally Posted by DrFeelgood
In addition, these 502s have MEFI 1 PCMs and the early MPI Keihin style injectors, but have the later cool fuel system instead of a VST. So it's possible someone bastardized the whole thing at some point over the years.
I believe you are correct. Pretty sure the MEFI 1's were only on VST engines
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Old 02-25-2022, 01:37 PM
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MEFI 1 with VST and mechanical pump mounted on raw water pump. MEFI 3 no mechanical fuel pump, and both used the standard fuel filter head
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Old 02-25-2022, 01:38 PM
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Originally Posted by AllDodge
MEFI 1 with VST and mechanical pump mounted on raw water pump. MEFI 3 no mechanical fuel pump, and both used the standard fuel filter head
No mechanical pump. Filter heads on the forward bulkhead, plumbed directly (albeit backwards) to Cool Fuel under port side of motor. PCM has connectors on the ends not on the top/side
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Old 02-25-2022, 01:46 PM
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Originally Posted by DrFeelgood
No mechanical pump. Filter heads on the forward bulkhead, plumbed directly (albeit backwards) to Cool Fuel under port side of motor. PCM has connectors on the ends not on the top/side
Sounds like a 7.4 L29 MEFI-2 and put on a 502
https://www.mercruiserparts.com/7-4l...-454-v-8-199-1

Look on the back of the MEFI for the numbers
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Old 02-25-2022, 02:09 PM
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Another thought, you sure its a 502?
Might check casting numbers
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Old 02-25-2022, 03:08 PM
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Originally Posted by DrFeelgood
Yup thanks. Gonna disassemble that after work and check it out.
Lucky for you the half your seat lifts up, those are a PITA to get to on most.
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Old 02-25-2022, 03:09 PM
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Originally Posted by Wildman_grafix
Lucky for you the half your seat lifts up, those are a PITA to get to on most.
Yeah. I pulled the PS pump and that gave me pretty good access laying face down on the back seat.
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Old 02-25-2022, 05:39 PM
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The screen under the regulator had just a tiny bit of debris in it. Nothing all that significant.
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