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Old 06-06-2016, 04:31 PM   #11
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Definitely BS on the fuel pump, but the seller perhaps just doesn't know. the bog symptom can be caused by a number of simple things; bad accelerator pump in the carb or maybe the timing is off, even fouled plugs. Could also be something more serious.

As Mike said do a compression test as a first step. While you have all the plugs out inspect each; all should be somewhat uniform in color and deposits. If any are obviously different then the cylinder it came out of needs to be scrutinized.
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Old 06-06-2016, 09:14 PM   #12
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Thanks for the input guys!

Heres what I have so far:
Checked the compression on the right side cylinders. They were between 160-170. They would leak down to about 150 after a minute or so.
Engine oil is nice and clean, even after being run quite a bit.
Changed the water fuel filter.
Verified accelerator pump is working. Engine runs smoothly when it runs. No misses or backfires or stumbles between cylinders. Plugs look decent- no signs of oil.

The owner installed a pump bulb between the tank and the water fuel seperator. I believe he was using this to help compensate for it starving for fuel, or at least the symptom of starving for fuel.

Im going to keep checking all the simple things. Is it possible to pick up tube in the tank has a problem?

Any other suggestions are welcome!

When I get on my computer later I will post some pics. And thanks again!

Oh, is there any way to rev the engine without engaging the foot? Other than takimg the throttle linkage loose? I havent had an inboard outboard in many years, so I know very little about the controls.
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Old 06-06-2016, 11:04 PM   #13
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Remove the pump bulb, does belong or help anything.

Check the anti-siphion valve in the tank it check ball may not be opening all the way.
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Old 06-07-2016, 12:42 AM   #14
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Heres what I have next:

I disconnected the line from the tank and hooked a temporary hose to it and sucked on it with my mouth. It was difficult to pull fuel up with my mouth and made a strange noise when I sucked. Tomorrow I will pull that fuel intake out and look at it.

In the meantime, I was going to hook fuel directly to a gas can and see if the engine would run ok that way. Now the fuel pump wont run! Is there a relay for the fuel pump? If so, where would I look to find it? Been searching on line for an answer but havent found one yet. Thanks again
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Old 06-07-2016, 01:53 AM   #15
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If it using the OEM set up the electric pump gets power from the starter soleniod when cranking and once started there is a oil pressure switch that provides the power.

This is a CG regulation so that if the engine dies the power is removed from the fuel pump as the oil pressure is zero.
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Old 06-07-2016, 02:30 AM   #16
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Thank you again mm. Im going to make sure I havent knocked a wire loose somewhere. Its unlikely the fuel pump has went out.
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Old 06-08-2016, 02:13 AM   #17
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Mm, i took out that pump bulb and ran a hose straight to a gas can and ran somejumpers to the fuel pump. It would not even pick fuel up. And I verified there are no restrictions in the line. Is it possible for a fuel pump to become weak from abuse?

Also, I took the anti siphon valve out to check it. I believe its bad because it takes quite a bit of suction with my mouth. Its a cheap part so I went ahead and ordered one.

Last, I am still not getting fire to the fuel pump when i turn the switch on. It was working when i first got the boat and now its not. I checked for loose wires. I understand how it works with ignition first then goes to oil pressure, but i dont know how to troubleshoot. Can you please give me some pointers?
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Old 06-08-2016, 02:18 AM   #18
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With this test are you sure the pump is actually running, should hear a mild hum?

I will provide a wiring diagram and some instructions tomorrow. But to start try measuring for 12V at the fuel pump connector while the key is in the crank, start position.

Oh yea call me Mike
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Old 06-08-2016, 02:50 AM   #19
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Ok Mike!

I know the fuel pump was running because I ran wires straight from the battery to the fuel pump. I could hear it running.

Thank you for all the help Mike!
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Old 06-08-2016, 03:11 AM   #20
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Your a good man Mike. If I ever get to Maryland I would be honored to buy you an adult beverage.
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