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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3342
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have a175hp mercury outboard that cranks and runs at idel

Customer Question

I have a175hp mercury outboard that cranks and runs at idel but dies when I give it more gas
Submitted: 5 months ago.
Category: Boat
Expert:  Charles replied 5 months ago.

Hello, my name is***** will assist you.

Would you please post the serial number of the engine?

Customer: replied 5 months ago.
oc290735
Expert:  Charles replied 5 months ago.

Thanks, ***** ***** engine been sitting for some time?

How old is your fuel?

Have you tested the compression and spark out out?

Customer: replied 5 months ago.
I was using the boat last Saturday it was running fine for about 3hrs. when trouble started
Expert:  Charles replied 5 months ago.

Did you get any alarms when this happened?

Are you still using the oil injection on the engine?

Customer: replied 5 months ago.
no alarms yes still using oil injection
Customer: replied 5 months ago.
gAS IS NOT OLD AND HAS ADDTIVE IN IT
Expert:  Charles replied 5 months ago.

Ok, when the engine stalls, is it like someone turns off the key, or it bogs down like lack of fuel. Remember that I am not there to troubleshoot this myself. All the info that I have is just what you tell me.

Customer: replied 5 months ago.
IT BOOGS DOWN LACK OF FUEL IT DIES AND ONLY RESTARTES WITH CHOKE
Expert:  Charles replied 5 months ago.

Ok, thanks. Will pumping the primer bulb over and over keep the engine running?

How do the 6 spark plugs look on the tips?

No need to yell, I'm tying to assist you.

Customer: replied 5 months ago.
NO PRIMER BLUB STAYS HARDWHEN ENGINE DIES SPARK PLUGS ARE NEW TIPS ARE FINE
Expert:  Charles replied 5 months ago.

How did the old plugs look?

Customer: replied 5 months ago.
OLD SPARK PLUGS WRENT WORN JUST SLIGHTY DIRTY IDONT PUT VERY MANY HOURS ON MY BOAT A YEAR
Expert:  Charles replied 5 months ago.

Ok, can you remove the fuel pump from the side of the block. Remove the hose from the front cover, then use the primer bulb to see what you are looking for is fuel from the front elbow and the hole in the rear of the pump.

Customer: replied 5 months ago.
BUT IT WILL BE TOMORROW
Expert:  Charles replied 5 months ago.

That is fine, there are no time limits here.

Expert:  Charles replied 5 months ago.

Once I know the answer to the fuel pump, I can continue to troubleshoot the engine with you.

If you would rather be on the phone with me while you work on the engine, I can submit that offer to you.

Customer: replied 5 months ago.
I removed the fuel pump and nogas came out of the elbow on the front, but gas came out of the hole in the back of fuel pump.
Expert:  Charles replied 5 months ago.

Ok, you have a torn diaphragm inside the pump. You will need 21-857005A1 to rebuild the pump. this is part of the issue with the engine staling. Repair the pump, then run the boat and see if the issue is not totally corrected.

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