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  #1   IP: 24.152.140.113
Old 09-20-2009, 02:24 PM
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Temp and oil pressure alarm

Mark,
I decided to start a new thread as this was a little off topic on the coils thread. In response to your question about my delay relay wired into the temp and alarm circuit (30 second delay before arming the alarm circuit), I connected it before the alarm buzzer on the positive side.

To be more specific, my ignition/start switch is the standard Cole-Hersee 3 position key switch (Off-Ign-Momentary start). For the alarm circuit, I took my power source from the IGN terminal on the key switch to a single pole toggle switch located on the engine control panel (serves as an override off switch - more on this below), then to the delay relay, then to the alarm buzzer. The temp and oil pressure sensors make the ground connection to the buzzer when they are outside acceptable ranges.

I have an electric fuel pump that I also use to purge the air after changing the fuel filter. I put a fuel grade Y valve between the pump and the carb that I use to direct the fuel either to the carb or back to the tank. Directing it back to the tank and switching on the ignition (no start), I can pump fuel through the filter in a loop returning to the tank thereby purging it. It takes about a minute. The reason for the toggle switch mentioned above is to shut down the alarm during this operation. A side benefit of the valve is that I can shut off the fuel just ahead of the carb when closing up the boat.

Note that this delay relay only involves the temp/pressure alarm system.

I hope I addressed your inquiry.

Neil
77 Catalina 30
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  #2   IP: 76.22.107.152
Old 09-20-2009, 11:42 PM
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Neil,
Thanks again for the info. Seems like a well thought out and interesting alarm system. One of these days, perhaps this winter, we'll see, I hope to install all new gauges and re-wire the instrument panel. I may incorporate an alarm system then.
Does your boat utilize a starter relay other than the starter solonoid?

Mark
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  #3   IP: 24.152.140.113
Old 09-21-2009, 09:18 AM
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No relay in my starting system other than the solenoid. I would expect as long as your momentary starter switch is rated for sufficient amperage you wouldn't need an additional relay and since yours has already given you problems I would make every effort to eliminate it. Depending on your existing system, this may mean increasing the wire size from the starter switch to the solenoid.

I have an engine control panel schematic available if you like.

Neil
77 Catalina 30
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  #4   IP: 206.125.176.3
Old 09-21-2009, 02:30 PM
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Neil,
I am interested in your schematic. I have a '77 C-30 as well, and I am hoping to re-wire the panel and add some new gauges this winter.

Thanks!
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  #5   IP: 134.39.100.70
Old 09-21-2009, 08:04 PM
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Neil,
I too would like to see your schematic. Thanks so much.

Mark
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  #6   IP: 75.198.192.234
Old 09-21-2009, 09:00 PM
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You have a return line to your fuel tank, independent of the pickup (a la a diesel)?

Bill
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  #7   IP: 24.152.140.113
Old 09-21-2009, 09:29 PM
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Admin,
Yes, I do. The previous owner had replaced the fuel tank and bless his heart, the "diesel" return port was included.

I've heard of others returning fuel via the vent port and I suppose with a properly installed vent line (uphill to the vent fitting without dips, sags or traps) it would work but please don't interpret the comment as a recommendation. For all I know, it could be a third strike felony to do so.

Neil
77 Catalina 30
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  #8   IP: 75.198.192.234
Old 09-22-2009, 09:35 AM
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Neil:

That return line gives you the makins' for a wonderful fuel polishing system.

Bill
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Old 09-22-2009, 09:56 PM
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I agree Bill, as long as I de-energize the coil during prolonged polishing.
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1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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  #10   IP: 75.198.5.39
Old 09-23-2009, 06:43 AM
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Yep!

I've been scratching my head over a fuel polishing system for an A4 for a long time, but I never could figure out how to get the filtered fuel back in the tank.

Bill
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Old 09-23-2009, 09:05 AM
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This conversation has given me an idea that solves the coil issue during fuel polishing. I'm going to change my alarm system single pole override off toggle switch to a 2 pole, one pole for the alarm, the other for the coil. With the switch off, both the alarm and coil are de-energized and the fuel pump can polish away as long as it likes. Also, it guarantees there is no engine operation without the alarm armed. The 2 pole switch allows me to power down the coil, yet keep it out of the delay system as well.

I should mention also that I have 2 fuel tanks on Kalina but the bypass/return is plumbed only to one of them. This gives me the ability to transfer polished fuel from tank 2 to tank 1.

And finally, last year I had some concerns over stale gas. There was no problem in performance but the gas had been sitting for a long time and I didn't want even the possibility of a problem so I disconnected the return hose at the tank end and put it in a jerry can, flipped the switch and popped open a cold one while the pump did all the work.

Guess which way I voted on the electrical/mechanical fuel pump poll!!
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1977 Catalina 30
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prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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Old 09-23-2009, 04:52 PM
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I gotta' believe there are some Senior Members watching this thread with considerable interest!

Bill
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