I have a 2000 mercury 150 efi I can get the serial number if need be but the Fuel pump works sometimes and some times it won’t. When it does boat runs perfect won’t have a a problem out of it. Boat can be sitting in the garage and will work for days when turning the key on. And may go out today and turn the key on and nothing. Any advice?
Most likely a problem in the ECU, the driver for it is going bad. Can be checked and repaired by companies like Simmons Motorsport, a sponsor here.
Mercury 2002 200hp Carbed Saltwater
OT566776
2002 Cape Horn 22' Bay
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Need to verify that the ECU connector is clean, the locking ring is in good shape and properly locked, and that the ground straps for the ECU and plate are intact/clean/good.
Then verify that indeed 12V+ power is being supplied on the PURPLE wire when the key is turned on.
If all above are good, take a jumper wire and add a separate ground to the NEGATIVE side of the fuel pump. You do NOT need the key on for this.
Pump should start.
Results match: Very likely the fuel pump driver in ECU is failing. Send to Simon Technologies for repair (see Sponsors List forum for contact info).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Serial number is 0t146430. I’ve checked two grounds is all I seen that is like straps on the plate of the ecu are there any other grounds I should look for?
Nope- those are the ones that could be in question.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
So I checked the purple wire I do have 12v. The key was turned on and I took a wire to make a separate ground and the pump run. so I assume it is the ecu correct?
yes sir sure sounds like it
.................................................. ...the scariest thing in life is the unknown ...................................
FWIW, I simply put a toggle switch in the dash to supply a ground when the ECM forgets to turn the fuel pump on. Sometimes I can fish for days without the issue but when it arises I just flip the switch and all is well.
.................................................. ...the scariest thing in life is the unknown ...................................
Have any problem with flooding or anything where the pump runs continuously
never let that pump run continuously if engine is not running
.................................................. ...the scariest thing in life is the unknown ...................................
+100Originally Posted by JOE54
With the engine running, the only drawback is that the pump is running at full-output all the time. ECU driver modulates the output by modulating the ground.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
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