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#12371510 - 08/03/17 06:20 PM 83 Mercury 90 HP (tower of power) fuel pump question
Austintatious Offline
Pro Angler

Registered: 03/09/09
Posts: 528
Hi everyone. My 83 TOP seems to be running really well, however when i stop and fish for a while, when I go to start it I find that the fuel has drained out of the line back into the tank and I have to pump the bulb again.

I have purchased a 5.oo one way valve to put in line but someone told me it is likely the fuel diaphragm leaking. I hunted down a kit but I also noticed a check valve listed among the parts on the exploded fuel pump view.

Does anyone know which of these I need? the diaphragm or the one way valve?

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#12371997 - 08/04/17 01:27 AM Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious]
CraZyNOTRT Offline
Outdoorsman

Registered: 01/04/13
Posts: 32
need to post your model number or serial to be sure. But if your going to rebuild the pump get the check valve assembly, which usually includes the diaphragms in the kit.

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#12372128 - 08/04/17 08:13 AM Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious]
Austintatious Offline
Pro Angler

Registered: 03/09/09
Posts: 528
the serial number is 6247291

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#12372590 - 08/04/17 02:50 PM Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious]
redchevy Offline
TFF Celebrity

Registered: 01/25/05
Posts: 6705
Loc: texas
If it is draining back to the tank there is a problem with your primer bulb also, it should act as a one way valve also.

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#12376259 - 08/07/17 02:28 PM Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: redchevy]
Austintatious Offline
Pro Angler

Registered: 03/09/09
Posts: 528
Originally Posted By: redchevy
If it is draining back to the tank there is a problem with your primer bulb also, it should act as a one way valve also.


I thought the same thing and replaced the bulb. Didn't fix it. I am talking after an hour or more in one spot this happens.

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#12377201 - 08/08/17 08:56 AM Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious]
Muzzlebrake Offline
Extreme Angler

Registered: 12/26/14
Posts: 1445
Loc: Euless
Are you tilting the motor forward when you stop to fish? If so the carbs will drain themselves out because the floats and float bowl is no longer sitting level.
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#12377403 - 08/08/17 11:28 AM Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious]
PlanoPaul Offline
Outdoorsman

Registered: 12/16/13
Posts: 202
Loc: Plano, TX
Anti siphon valve?

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#12378349 - 08/08/17 08:58 PM Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Muzzlebrake]
Austintatious Offline
Pro Angler

Registered: 03/09/09
Posts: 528
Originally Posted By: Muzzlebrake
Are you tilting the motor forward when you stop to fish? If so the carbs will drain themselves out because the floats and float bowl is no longer sitting level.


No, I do not do this.

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#12381407 - 08/10/17 10:16 PM Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious]
BCB Offline
Angler

Registered: 12/31/06
Posts: 392
The fuel pumps are simple and the diaphragms are hard to come by for a tower of power. Great motors and they last a long time on the older ones.

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#12381491 - 08/10/17 11:20 PM Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious]
bronco71 Online   content
Extreme Angler

Registered: 02/05/06
Posts: 1254
Loc: Farmers Branch/Sulphur Bluff
I have had new primer bulbs that were bad a couple times, also some of them only have 1 valve to keep fuel from returning to the tank, the better ones have 2 and work better and last longer.

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#12381556 - 08/11/17 06:39 AM Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11095
Loc: Littlefield Tx & Lake A. H. US...
Any slight fuel hose leak between the bulb and the carbs will allow the bleed down. I first eliminate the quick connector for the fuel hose.
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