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selecting a timed 12volt swtich setup


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bocephus660 
Member - Posts: 8
Member spacespace
Joined: October 21, 2013
Location: North Dakota, United States
Posted: April 21, 2015 at 9:34 PM / IP Logged Link to Post Post Reply Quote bocephus660
this is a little off the beaten path of normal conversation around here......but i hope one of you guru's can lend your advice. i am installing an auxiliary fuel tank in the bed of my truck. i am using a 12v transfer pump to pump fuel from the aux tank to the main tank. i want to install some sort of switched timer on transfer pump so i dont accidentally forget the pump on and overfill my main tank.
it doesnt have to be anything fancy. my only reqirements are:
1. simple to use
2. time range of at least 30 minutes, but does not have to be more than 60 min.
3. under $50
Custom_Jim 
Copper - Posts: 193
Copper spacespace
Joined: November 28, 2003
Location: Missouri, United States
Posted: April 23, 2015 at 11:06 AM / IP Logged Link to Post Post Reply Quote Custom_Jim
Don't laugh, but years ago I wired up one of the mechanical bathroom fan timers to a rear cargo light to where you would twist the knob to the desired time to have the dome light on and then after it timed out, the dome light went off ready for the next time to be used. I mounted it in a single gang electrical box but some come apart to where you could do something custom.
Just watch the amperage ratings and your requirements. If the pump draws less power than the switch,your good, but if it draws more you may have to add a relay.
http://www.amazon.com/Woods-59717-Decora-60-Minute-Mechanical/dp/B001XCWLX8
Jim
1968 Chevy II Nova Garage Find 2012
1973 Nova Custom
1974 Spirit of America Nova
1973 Nova Pro-Street
1977 Nova (Sold)
tonanzith 
Gold - Posts: 583
Gold spaceThis member consistently provides reliable informationspace
Joined: July 18, 2008
Location: Washington, United States
Posted: April 23, 2015 at 2:23 PM / IP Logged Link to Post Post Reply Quote tonanzith
I would use a pac tr7 timer module and program it to whatever time you like. It seems to me tho that if it was left running and was set for a time and you forget it depending on the tank it could still over fill. If it were me I would tank level sensors which are cheap and wire them to a relay so when the tank reads full it cuts power to the pump. That means no timer and 100% no chance over over filling or forgetting. Or even a washer fluid style level sensor like this one.
http://www.carparts.com/details/APA-fs-URO_Parts/Washer_Level_Indicator/W0133-1632206.html?TID=80000000CP&origin=pla&CP=1&CP_SRC=PPC&003=27372932&010=cpW0133-1632206WaLeInAPPa&gclid=CjwKEAjwsOKpBRCDtfOnzaDg3HsSJAAJ2oji7z6BCXzj_wdeaeZByuwAzn-DPuBzs-_mqxu3KnoAPRoC7_fw_wcB&c_aid=45534008133&c2cid=6bbc3ea5-1a32-4b46-94a9-81cbcf6577d1
$6
And a $1 spdt relay from Napa.
Gary Sather
tonanzith 
Gold - Posts: 583
Gold spaceThis member consistently provides reliable informationspace
Joined: July 18, 2008
Location: Washington, United States
Posted: April 23, 2015 at 2:29 PM / IP Logged Link to Post Post Reply Quote tonanzith
Or a fluid level switch wired to a relay like this switch.
http://www.onlinecomponents.com/honeywell-lle102000.html?p=11935504&utm_content=hwEQc92v&utm_medium=cpc&utm_source=google&utm_campaign=Shopping+4&utm_term=&cshift_ck=7C6E44E4-1EA1-4C6B-94CC-7149D36B0927cshwEQc92v
Gary Sather
hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: April 29, 2015 at 7:26 PM / IP Logged Link to Post Post Reply Quote hotwaterwizard
This still does not Guarantee that the tank will not be over filled.
a float would be a nice add-on to this circuit.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
bocephus660 
Member - Posts: 8
Member spacespace
Joined: October 21, 2013
Location: North Dakota, United States
Posted: April 30, 2015 at 2:54 PM / IP Logged Link to Post Post Reply Quote bocephus660
my pump will only do 20 gal/hour. my main tank is 34 gallons. if i use my head, it wont overflow even if i forget to turn the pump off.
hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: May 08, 2015 at 10:04 PM / IP Logged Link to Post Post Reply Quote hotwaterwizard
Custom_Jim wrote:
Don't laugh, but years ago I wired up one of the mechanical bathroom fan timers to a rear cargo light to where you would twist the knob to the desired time to have the dome light on and then after it timed out, the dome light went off ready for the next time to be used. I mounted it in a single gang electrical box but some come apart to where you could do something custom.
Just watch the amperage ratings and your requirements. If the pump draws less power than the switch,your good, but if it draws more you may have to add a relay.
http://www.amazon.com/Woods-59717-Decora-60-Minute-Mechanical/dp/B001XCWLX8
Jim
Great Idea Genius
Home Depot $19.97 Defiant Model # 49823 Internet # 204209953 Store SKU # 1000015594
20 Amp 60-Minute In-Wall Spring wound Timer with White and Almond Wall Plate http://www.homedepot.com/p/Defiant-20-Amp-60-Minute-In-Wall-Spring-wound-Timer-with-White-and-Almond-Wall-Plate-49823/204209953?N=5yc1vZc334
selecting a timed 12volt swtich setup -- posted image.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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