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need ecu 1997 200 efi mercury #13946675 04/04/21 12:07 PM
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rchampion202 Offline OP
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mine has a glitch it will lose power to fuel pump every now and then can tap on ecu and in will work

Re: need ecu 1997 200 efi mercury [Re: rchampion202] #13947648 04/05/21 03:38 AM
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TLW Offline
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if its JUST tha pump deal you can by-pass tha pump driver circuit... a good ecu will be hard ta find.

Re: need ecu 1997 200 efi mercury [Re: rchampion202] #13947755 04/05/21 12:17 PM
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rchampion202 Offline OP
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i was told you could put a wire from a on key hot on power block to pump hot and another ground and make it work just make sure to keep key off when not running motor is this rite

Re: need ecu 1997 200 efi mercury [Re: rchampion202] #13948003 04/05/21 03:20 PM
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TLW Offline
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disconnect both wires at pump and tape 'em up.. find any purple on tha motor.. should be one on starboard side.. maybe ona a plastic term block.. thats a "switched hot" tha will go ta positive term on pump.. ground/neg can go anywhere on tha block.. i always used a relay ta do this but there are lots out there without out a relay.. that keeps some of tha load off tha purple.. up ta you...

Last edited by TLW; 04/05/21 10:47 PM.
Re: need ecu 1997 200 efi mercury [Re: rchampion202] #13955919 04/11/21 05:23 PM
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rchampion202 Offline OP
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what type and kind of relay thank so very much been at fork last 5 days had to take cover off at least twice a day to tap on ecu to get pump to start again

Re: need ecu 1997 200 efi mercury [Re: rchampion202] #13956037 04/11/21 07:34 PM
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TLW Offline
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https://www.summitracing.com/parts/prf-30131

there are more expensive and less expensive but this is tha one i've used most...

diagram for relay..... small yellow/white (relay) will make up to any boat/motor purple

https://static.summitracing.com/global/images/instructions/prf-30131instruction.pdf

Last edited by TLW; 04/11/21 07:43 PM.
Re: need ecu 1997 200 efi mercury [Re: rchampion202] #13961024 04/15/21 01:13 PM
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Cmack Offline
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The fuel pump is constantly hot, ecu provides a ground to initiate the pump. I ran a ground wire with a waterproof toggle switch to the dash and those times that the ecu "forgets" to turn the pump on, I simply flip the switch and bingo. Normally I can flip the switch back off and it'll continue to run. Only issue if that you must remember to turn the toggle switch off when you shut it down because the pump will continue to run. Once you take the ecu out of the loop the pump will no longer cycle off when the required pressure is reached or the key is turned off. I have run this set up for 3 years now with zero issues.

Last edited by Cmack; 04/15/21 01:16 PM.

Re: need ecu 1997 200 efi mercury [Re: rchampion202] #13961080 04/15/21 01:42 PM
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boatman025 Offline
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Send it to CDI, they can check it out for you


Hughes Marine
3855 Osage Lane
Wylie ,Texas
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