Fuel Delivery Start Problem


Old 09-10-07, 03:25 PM
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Unhappy Fuel Delivery Start Problem

I have a 4.3l Mercury on 1996 year boat. My problem is a starting the engine. The engine won’t start at all. If I manually put fuel in carburetor it starts immediately. But I have to keep adding like a whole bottle of 750ml so he can start running by it self and it will start the next day with no problem. But if I try to run in a week or two it won’t do it again. I have to start putting fuel in carburetor manually again.
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Old 10-16-07, 04:53 AM
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Starting problem

i had a problem close to that on my 454 merc. i had removed the maniflods and when i did i had to slightly move the fuel pump. when i put everything back it would start (like yours) we found that the loose conection caused a vacume leak. Take a wrench and check all of your connections.
Old 10-16-07, 09:29 PM
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The fuel pump or filter mounted on the pump can be weak or seeping vaccuum. A pressure/ vaccuum test of the assembly
will reveal the source.
The pump should hold 3-5 psi vac.
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