1998 Mercury, 200 HP, Blue Water, EFI Outboard Engine

RJGTRUCKING

Recruit
Joined
Oct 13, 2015
Messages
2
I have an engine that I had change by a marine mechanic. He basically bolted it on my boat. Now the engine being spoken about was mine but on another boat. Now with that being said the engine ran perfectly on another boat. After changing, the mechanic just handed me the boat, not running, not rewired, not running obviously. The problem I am having most is; while pumping the primer bulb, gas is coming out the over flow. I think I know that the needle and seat is not seating, allowing the gas to flow. The next problem I have is, the power at the top of the fuel pump. Should the electrical connections be showing power all the time, or should it go off when the switch is off? Now the boat has been setting for a while (3 years), but the wiring under the cowling hasn't been revised at all. I am going to take the fuel pump housing apart and check the needle and seat, hopefully solving one of my problems. And try to check the fuel pump to see if it is running. I hope I can touch 2 wires to check it out. How does a person verify that the fuel pump is working. I can hear it thumping when the switch is on, but it doesn't seem to be pumping fuel. Is there a way to check it before buying a new one?
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,931
Should the electrical connections be showing power all the time, or should it go off when the switch is off?
The fuel pump will have 12 volts on the + all the time, the ECU varies the ground ...
I am going to take the fuel pump housing apart and check the needle and seat, hopefully solving one of my problems
Your going the right route as float in VST is stuck for a reason be it debris or gunk...
How does a person verify that the fuel pump is working. I can hear it thumping when the switch is on, but it doesn't seem to be pumping fuel. Is there a way to check it before buying a new one?
If the pump is running check the fuel pressure on the schrader valve on fuel manifold, should be 36psi or higher. If not the pump or regulator is defective or stopped up...
 
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