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Low Fuel Pressure Switch

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Arty Trost

Joined: 25 May 2006
Posts: 205
Location: Sandy, Oregon

Posted: Mon Mar 26, 2007 5:54 am Post subject: Low Fuel Pressure Switch

Hi Kolbers -

Can anyone out there help me locate a switch that

turns on an electric fuel pump when fuel pressure

drops below 2psi.

I need to connect 1/4'' or smaller tubing to the

pressure sensing end. The switch needs to be DC rated

for 3A or more. I will be switching 12V. Sealed or all

weather switch would be better.  

To repeat: SPST connected when sensing less than 2psi.

Disconnects at 2psi or above.

I was told this is the brand and part number.

Honeywell/Hobbs

PN 76061_2  MO

I've heard that the same switches and part numbers are

also branded as Stewart Warner.



Anyone familiar with this type of switch (whether a

Honeywell/Hobbs or S. Warner) and know where I can get

one?



Thanks -



Arty



www.LessonsFromTheEdge.com



"Life's a daring adventure or nothing"

                      Helen Keller



"I refuse to tip toe through life just to arrive safely at death."

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olendorf

Joined: 06 Jul 2006
Posts: 140
Location: Schenectady, NY USA

Posted: Mon Mar 26, 2007 6:06 am Post subject: Re: Low Fuel Pressure Switch

Won't it just shut off again as soon as the psi increases?  Wouldn't that just turn on and off constantly?  Or is it a turn it on and leave it on type of thing?

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_________________
Scott Olendorf
Original Firestar, Rotax 447, Powerfin prop
Schenectady, NY
http://sites.google.com/site/kolbfirestar/

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Mon Mar 26, 2007 6:15 am Post subject: Low Fuel Pressure Switch

| Can anyone out there help me locate a switch that

| turns on an electric fuel pump when fuel pressure

| drops below 2psi.

 |

| Arty

Arty:



I would rather go with a manual switch on the boost pump.  Leave it on 

all the time, or on take off and landing, and when under 1,000 feet 

AGL.



This is how I operate my boost pump.



john h

mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

NeilsenRM(at)comcast.net
Guest

Posted: Mon Mar 26, 2007 6:48 am Post subject: Low Fuel Pressure Switch

Arty



I put what you gave us into a Google search and found the following site:

http://www.alliedelec.com/Search/SearchResults.asp?N=0&Ntk=Primary&Ntt=Honeywell/Hobbs&Source=google&sid=46070D00220CE17F



Hope this helps. Like others suggest, you may want to add a relay with loop 

in the circuit that will keep the backup pump energized till you power down 

the plane.



Rick Neilsen

Redrive VW powered MKIIIc



---

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by0ung(at)brigham.net
Guest

Posted: Mon Mar 26, 2007 2:12 pm Post subject: Low Fuel Pressure Switch

Anyone familiar with this type of switch (whether a

Honeywell/Hobbs or S. Warner) and know where I can get

one?



Thanks -



Arty



OOOOOOOOOkkkk  I am thinking of a switch that I have seen on pool and hot

tub boilers....   they are about the size of a quarter or a bit larger...

and the body is about 1/2 inch thick with an inch or so overall including

the plumbing connection which I think is 1/8 inch pipe thread...  I know

they have an adjustment for sensitivity,,, but not sure what the adjustable

range is...

As for on off  on  off....  you could put in a warning light on the dash

that would warn you if it were activated....   and a manual switch to bypass

the pressure switch to keep it on continuous...  and if you wanted it off

for some reason... the manual switch could be a double throw switch with a

center off position...  labeled off  auto   on   



Boyd.

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