Fuel pump inspection

[Keith Buchanan]

50 HP 3 cyl 1989 elpto. Can anybody tell me what to expect when I pull the fuel pump. I need to inspect the diaphram and I take it I will need to replace gaskets along the way.<br /><br />Regards Keith B..

 

[achris]

Re: Fuel pump inspection

Keith,<br /><br />For the cost of the pump kit, which contains all the gaskets and diaphrams, just change everything.<br /><br />Just be careful to replace the correct diaphrams. Some have holes in them, others don't. Don't mix 'em up.<br /><br />Part number of the kit is 21-42990A4<br /><br />Chris.

 

[Elmer Fudge]

Re: Fuel pump inspection

Ditto! <br /><br />editart#21-42990A4 has been substituted for part#21-857005A1

 

[Keith Buchanan]

Re: Fuel pump inspection

Cheers guys..anyone describe how the pump operates so as I can sleep on it while my fuel pump kit arrives..<br />Thanks all Keith B..

 

[Elmer Fudge]

Re: Fuel pump inspection

The fuel pump operates by the suction and compression created by the up and down movement of the pistons in the cylinders, this causes the diaphragm to flex in and out which sucks in fuel then pushes it towards the carbs as the valve disc is raised.<br /><br />Do have a repair manual? it can be ordered at the bottom left of this page

 

[Keith Buchanan]

Re: Fuel pump inspection

Thanks EF, with the positioning of the pump I was wondering how it could be mechanically connected to the crank but as you have just pointed out it is vacum driven.<br /><br />Regards Keith B..