[C320-list] Mechanical vs. Electric Fuel Pumps

[David Swanson]

My Yanmar 3YM30 and a Yanmar 2GM20 on a previous sailboat we owned had mechanical fuel pumps.  Both were cam driven as Warren noted.  I know this because I carry spares aboard. 

Dave
 
On Dec 18, 2010, at 1:04 PM, Warren Updike wrote:

> On our Perkins, the fuel pump is mechanical but not driven by a gear.  I
> believe it is operated by a cam on a crank shaft or geared to the crank.
> The pump, technically a lift pump, has a spring loaded piston that extends
> into the block and is operated by the action of the cam.  The function of
> the lift pump is to insure that the high pressure injection pump is kept
> fully supplied with fuel. 
> 
> I understand several of the Yanmar engines are fitted with electric lift
> pumps.
> 
> Warren & Pattie Updike
> 1994 C320 #62 "Warr de Mar"
> 
> -----Original Message-----
> From: Jeff Hare [mailto:catalina at thehares.com] 
> Sent: Saturday, December 18, 2010 8:06 AM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Mechanical vs. Electric Fuel Pumps
> ps, ca
> Mechanical fuel pump on a diesel for sure. 
> 
> Since diesels don't need electricity once running, an eletrical pump woud be
> a liability.  Also mechanical pumps are frequently gear driven not belt
> driven. 
> 
> The yanmar 3gm has a gear pump I believe. 
> 
> -Jeff
> ------Original Message------
> From: David Detrick
> Sender: c320-list-bounces at lists.catalina320.com
> To: c320-list at lists.catalina320.com
> ReplyTo: C320-List at Catalina320.com
> Subject: [C320-list] Mechanical vs. Electric Fuel Pumps
> Sent: Dec 17, 2010 11:16 PM
> 
> Mechanical  vs. Electrical Fuel Pumps-- what are the pros and cons of each. 
> 
> 
> 
> I have an electrical and am concerned that if I lose power due to an
> emergency situation, my engine will not run. Mechanicals have belts that
> might go out, but not necessarily in an emergency situations.
> 
> 
> 
> Would appreciate folks weighing in on this one.
> 
> 
> 
> Thanks.
> 
> 
> 
> 
> 
> 
> 

David Swanson
kswanson123 at comcast.net