Hunting for bilge pump Thundercraft 1986

MotorMan101

Seaman
Joined
Sep 28, 2022
Messages
73
I can't figure out where my bilge pump is ...I tried turning it on but don't hear anything (probably dead pump) . I can't figure out if there is a way to lift up floor or how you see what's located under it...I see a hose coming up next to the gas tank fill that I think must be for the pump...but I can't see where it goes once its under the floor...
 

Bondo

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Staff member
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Apr 17, 2002
Messages
71,103
Ayuh,..... I/O, or outboard,..??

If an outboard, there's probably a pocket for it at the hull drain plug, or very close by,.....
If an I/O, it's usually under the motor,....
 

MotorMan101

Seaman
Joined
Sep 28, 2022
Messages
73
Ayuh,..... I/O, or outboard,..??

If an outboard, there's probably a pocket for it at the hull drain plug, or very close by,.....
If an I/O, it's usually under the motor,....
Its a outboard, there is a recessed area where the motor connects to the transom and that has a drain plug, but its open so Its defiantly not in that(I don't see any old mounting points or holes either)... on either side of the recessed area is decking. The only hole I have found going under the decking is where the big gas tank fill tube goes, the fuel line and a un known tube which connects to a 90degree vent on back of the boat. All try to get some pictures later today.
 

briangcc

Commander
Joined
Jul 10, 2012
Messages
2,415
Well....on the outside of the boat, on one of the sides back near the transom, is there a bilge discharge opening? Gonna be up high above the water line if its there. When you find that, you can trace the hose back inside the boat to the pump.

Might have to remove a seat or two or perhaps a cooler to find it in the boat.

If there's no opening above the waterline in the back of the boat, you more than likely don't have a bilge pump. At which point, depending on the configuration of the boat, it may be advisable to add one.
 

Bondo

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Staff member
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Apr 17, 2002
Messages
71,103
Its a outboard, there is a recessed area where the motor connects to the transom and that has a drain plug, but its open so Its defiantly not in that(I don't see any old mounting points or holes either)... on either side of the recessed area is decking. The only hole I have found going under the decking is where the big gas tank fill tube goes, the fuel line and a un known tube which connects to a 90degree vent on back of the boat. All try to get some pictures later today.
Ayuh,..... That unknown line is no doubt the tank vent line, 'n it sounds like you don't have a bilge pump,......
 

MotorMan101

Seaman
Joined
Sep 28, 2022
Messages
73
Ayuh,..... That unknown line is no doubt the tank vent line, 'n it sounds like you don't have a bilge pump,......
A Tank vent would make sense maybe I don't actually have a pump. The only reason I think I do is that there is a switch for it on the dash. Also the dash is original with the matching boat logos and I see no sign its been modified. The switch has wires going so made all try tracing from there....

I think I will take some time and look for other outlet pipes because if there is a pump there should be a outlet...
 

MotorMan101

Seaman
Joined
Sep 28, 2022
Messages
73
So turns out I don't have a pump at the moment but the wire to for it is still in the boat. Its a brown wire from the control switch and goes straight to the back of the boat. I will try to get my hands on a new bilge pump. Here are pictures I promised earlier.
 

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