Fuel line problems?

[airpix]

My 1982, 18 HP Mercury is starving for fuel. I thought it was the old fuel line and primer bulb but a new line didn't solve the problem. The engine runs fine a low rpms but after a couple of minutes at full power it starts to cut out and the only way I can keep it running is to pump the primer bulb. It even starves with the fuel cap off, bypassing the vented cap.

Has anyone else run into this problem?

Thanks,

John / Airpix

 

[Can't Cast]

Re: Fuel line problems?

Classic fuel pump diaphragm symptom. If you can pump the primer bulb on the gas tank and it runs OK, but starves when you stop pumping the bulb...you have a hole or crack in the diaphragm.
They typically rot and crack in the off-season. Should be an inexpensive fix. You can easily do yourself.

 

[fbinsley]

Re: Fuel line problems?

i have this same problem with my merc 75..what is the diaphram?

 

[section8]

Re: Fuel line problems?

its part of the fuel pump. buy a fuel pump repair/rebuild kit. its easy to do yourself. i bought one and didnt install it til the boat NEEDED it. did it in the parking lot at the boat ramp in 10 minutes. i either had a repair manual with me or the pump kit came with pictured instructions!Easy fix

 

[Jacket4life]

Re: Fuel line problems?

Glad to hear it is so easy, bout to do mine for the fisrt time!

 

[airpix]

Re: Fuel line problems?

My outboard is a 1982? Mercury 18XD, ser# A117962 and I'm having a bugger of a time locating a kit (or any parts for that matter) Does anyone have a good source?

Thanks,

John

 

[Deep V]

Re: Fuel line problems?

Yes,I have a '79 Mariner,all NLA. At www.sea-way.com I was able to find every thing I needed.They don't have a catalog, you just fill out a search form, so you'll need to go to www.crowleymarine.com to get your part no. from their parts diagrams. Crowley may even have it.

 

[airpix]

Re: Fuel line problems?

Thaks DeepV