Agree with Dave. Keep things simple. FWIW, The fuel pump on the M4-30 is original design. Says right in the manual that it eliminates the need to bleed air, as it pumps more volume than the engine requires and the excess returns to the tank, so it also polishes the fuel when running. When my fuel tank started leaking, I stuck the return line from the tank, into jerry cans and ran the pump by simply turning the key and was able to pump the majority of fuel out. Three cans of fuel I donated to a friend's heating oil tank. Replaced the tank in the boat, added new fuel, and ran the pump again for about fifteen minutes. Engine started right up without any bleeding. It's similar to glow plugs. Many engines don't have them and can be hard to start. A friend told me he uses a hair drier to preheat his Yanmar when it's cold out. It really comes down to learning your particular engine and what it likes. And these discussions help that process along. Chuck S
> On 06/29/2023 10:26 AM EDT Dave S via CnC-List <cnc-list@cnc-list.com> wrote: > > > Hadn’t thought of it before but even with a diesel this is a good reason to > stick with a stock mechanical fuel pump if so equipped. I’ve mused about > ‘improving’ my yanmar 2GMF20 but in stock form it has been very reliable. > Its fuel pump lived a long life and started seeping as a warning. (I ignored > that for too long but that’s another story) it was dead simple to replace, > bleed and get rolling again. Sometimes less is more. > > Dave 33-2 Windstar (for sale) > Alubat OVNI 435 (for sail) > Sent from my iPhone > > > > On Jun 29, 2023, at 10:13 AM, Joe Della Barba via CnC-List > > <cnc-list@cnc-list.com> wrote: > > > > > > > > > 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 > > > 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 >
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
