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Question

I have a 2000 15hp 4 stroke. I draw fuel from my 40 gallon main tank. It had a problem loosing it fuel when trolling, so I put a two way valve in to stut off fuel to V8 motor, That worked great all last season. Now it is back to same problem. Tightened all fittings, prime bulb seems fine. I install a 2psi pump for now, but hate the noise and having to remember to shut off. I fish Salmon tournaments.
Thank's Chip

Submitted: 266 days and 18 hours ago.
Category: Boat
Value: $9
Status: CLOSED
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Accepted Answer

I would guess your problem is one of three things.

1. fuel pump on small motor is bad or weak.

2. The vent on your large tank is partially plugged and the smaller motor does not have enough suction to get fuel.

3. The Anti syphon valve on the fuel tank is to strong to let the small motor suck the fuel out.

 

Try running the small motor on a seperate fuel system. That will tell you if the problem is in the boat or the motor.

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Expert: davesoutboard
Pos. Feedback: 98.9 %
Accepts: 1071
Answered: 6/28/2009

Marine Mechanic

marina owner for 20+years, certified Evinrude tech

266 days and 16 hours ago.

Reply

Dave's answers were fine, but I have already tried all his tips.

Posted by davesoutboard 266 days and 16 hours ago.

Info Request

Sorry I had no way of knowing. Did you run it on another tank?

265 days and 22 hours ago.

Reply

Yes it runs fine on 6 gallon tank. I put in new diaphram in pump, but I think I will try new pump? Is there a larger pump for the Mercury 15hp? Or a quieter electric pump? All gas lines and primer bulb are new. I had a quick disconnect in line, but removed it. I removed the anti syphon valve completely for now. Still no luck! Trolls fine for about 15 to 20 minites, then dies if you do not quickly pump primer. I am at wits end.
Thank's Chip

Posted by davesoutboard 265 days and 18 hours ago.

Answer

That is hard to believe. If it runs on the other tank then the problem is in the boat not the motor. I know of no other fuel pump available. Did you check the vent on the large tank?

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