Fuel pump problems
#1
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He guys...I have a problem on my friend boat.He heas a 7.4 mercruiser with a holly 4175 carb.He heas problem with flooding from only one bouvl on the seckundary part of the carb.I mesured the fuel press and at idle is 9 psi.The fuel pump is monted on the block and it is black color.The vacum on the pump is conected to the port vacum on the carb the line is god no vacum leak.Can you tell me is the pump pumping to much fuel and is there a diffrent pump thet goes on the engine with less psi...thank you
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SB (05-12-2022)
#5
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Sometimes 9 is okay. I’d change the needle and seat first. In fact, if both haven’t been changed in 5 yrs or more, i’d change both.
and x 2 on the fuel pump vent. It goes to s vent on carb or flame arrestor, not vacuum port. A vent port can look like a vacuum port, so check it.
and x 2 on the fuel pump vent. It goes to s vent on carb or flame arrestor, not vacuum port. A vent port can look like a vacuum port, so check it.
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Last edited by SB; 05-12-2022 at 12:48 PM.
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articfriends (05-13-2022)