On a gasoline powered engine the oil pressure switch is a vital safety device, if you don’t have it and the engine stalls or you just leave the key on, a leaky float valve will have your entire fuel tank pumped into the bilge. I suspect it carried over in some ABYC reg into diesels.
I have solved a couple frustrating issues on my boat with a fuel pressure gauge. I would think about installing a pressure gauge on the output side of the lift/low pressure pump on any engine, gas or diesel. Mine is electric and is mounted in the cockpit, it lights up a red alarm light when the fuel pressure is below 1 PSI. Joe Della Barba Coquina C&C 35 MK I Kent Island MD USA From: CHARLES SCHEAFFER via CnC-List <cnc-list@cnc-list.com> Sent: Thursday, June 29, 2023 12:00 AM To: Stus-List <cnc-list@cnc-list.com> Cc: Neil Gallagher <njgallag...@optonline.net>; CHARLES SCHEAFFER <cscheaf...@comcast.net> Subject: Stus-List Re: Engine strangeness On my Universal M4-30, things work differently. The fuel pump is energized when you turn on the key switch, so that ticking starts before starting the engine and doesn't stop until you turn off the key switch. I think this is a better way to operate the system and I don't understand why anyone would interlock a fuel pump to the glowplug button and the oil pressure switch. Too complicated and unecessary. Chuck Scheaffer Resolute, 1989 C&C 34R Annapolis On 06/28/2023 8:53 PM EDT Neil Gallagher via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote:
Please show your appreciation for this list and the Photo Album site and help me pay the associated bills. Make a contribution at: https://www.paypal.me/stumurray Thanks for your help. Stu
