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Jan 23rd, 2013
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83 Mercury 90 HP (tower of power) fuel pump question #12371510
08/03/17 11:20 PM
08/03/17 11:20 PM
Joined: Mar 2009
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Austintatious Offline OP
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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?

Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious] #12371997
08/04/17 06:27 AM
08/04/17 06:27 AM
Joined: Jan 2013
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McKinney, Tx
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CraZyNOTRT Offline
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McKinney, Tx
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.

Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious] #12372128
08/04/17 01:13 PM
08/04/17 01:13 PM
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Austintatious Offline OP
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the serial number is 6247291

Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious] #12372590
08/04/17 07:50 PM
08/04/17 07:50 PM
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texas
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redchevy Offline
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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.

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

Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious] #12377201
08/08/17 01:56 PM
08/08/17 01:56 PM
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Euless
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Muzzlebrake Offline
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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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Then He made the earth round...and He laughed and laughed and laughed!

Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious] #12377403
08/08/17 04:28 PM
08/08/17 04:28 PM
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Posts: 304
Plano, TX
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PlanoPaul Offline
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Plano, TX
Anti siphon valve?

Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Muzzlebrake] #12378349
08/09/17 01:58 AM
08/09/17 01:58 AM
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Austintatious Offline OP
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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.

Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious] #12381407
08/11/17 03:16 AM
08/11/17 03:16 AM
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BCB Offline
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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.

Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious] #12381491
08/11/17 04:20 AM
08/11/17 04:20 AM
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Farmers Branch/Sulphur Bluff
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bronco71 Offline
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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.

Re: 83 Mercury 90 HP (tower of power) fuel pump question [Re: Austintatious] #12381556
08/11/17 11:39 AM
08/11/17 11:39 AM
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Littlefield Tx & Lake A. H. US...
gary purdy Offline
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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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