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CJ fuel sending unit

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keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Thu Jun 18, 2009 6:30 am Post subject: CJ fuel sending unit

Is it possible to replace the stock CJ resistance unit with a bendable capacitance fuel probe that would allow the display of the actual fuel when full vs 60 liters. Has anyone tried this?

viperdoc(at)mindspring.co
Guest

Posted: Thu Jun 18, 2009 7:09 am Post subject: CJ fuel sending unit

Not to my knowledge...there are a few adaptable probes from boat companies

that are out there that would work.

Doc



--

N13472(at)aol.com
Guest

Posted: Thu Jun 18, 2009 8:04 am Post subject: CJ fuel sending unit

There are several units available. Try  this.



  

Displaying results 1 - 1 of 1 match (0 seconds) 

 1. PRINCETON CAPACITANCE FUEL PROBES



PRINCETON CAPACITIVE FUEL PROBES * Easy Push Button Calibration - Simple

push buttons make calibration easy and accurate. No sensitive screw

adjustments to make. Place the probe in tank, ...

http://www.aircraftspruce.com/catalog/inpages/princefuelprobes.php - 3.8kb



Tom Elliott

CJ-6A NX63727

702-595-2680 

 



Result page: 1 

  



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gill.g(at)gpimail.com
Guest

Posted: Thu Jun 18, 2009 8:53 am Post subject: CJ fuel sending unit

Guys,



Sender probe location and wing dihedral make a full tank reading impossible

with electronic probes.  A new hole in your fuel tank at the outboard most

point would be required.



Gill  



--

dsavarese0812(at)bellsout
Guest

Posted: Thu Jun 18, 2009 9:55 am Post subject: CJ fuel sending unit

Now THAT'S an excellent answer!

 Dennis

  

 [quote]   ---

keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Thu Jun 18, 2009 11:56 am Post subject: Re: CJ fuel sending unit

 	  gill.g(at)gpimail.com wrote: 	
		  Guys,



Sender probe location and wing dihedral make a full tank reading impossible

with electronic probes.  A new hole in your fuel tank at the outboard most

point would be required.



Gill  



-- 	




I got that part figures out that's why I was wondering if anyone had come up with and accomplished some alternate method like using the hole that's already there at the drain.

gill.g(at)gpimail.com
Guest

Posted: Thu Jun 18, 2009 12:43 pm Post subject: CJ fuel sending unit

The drain has minimal space between the wing surface and the tank plus it is

only 3/8 or 1/4 inch NPT fitting.  Electronic sender probes require some

space for sealing the electronics from the fuel.  Also the internal baffling

could present probe barriers.  Using a probe through a tee fitting in the

fuel supply line may work better if the 1/4 diameter probe did not obstruct

the fuel flow and could be threaded through the baffling.  The main issue

here then would be support for the probe tip.  I think a 33 inch probe

length is available through my supplier and others.



--

keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Thu Jun 18, 2009 2:30 pm Post subject: Re: CJ fuel sending unit

Excellent point about the baffling!



I'm finding that after a year of ownership that there are very few modifications worth doing on an airplane that's been around a while.  Seems  that if there was a better way the Chinese probably would have done it. 



The few mods that I have; oil filter, auto spark plug kit, air filter and intake drain seem like no brainers. Messing with an otherwise decent fuel system is probably not worth the effort. Time and money probably would be better spent on a FF system.



Keith

cjpilot710(at)aol.com
Guest

Posted: Thu Jun 18, 2009 7:08 pm Post subject: CJ fuel sending unit

In a message dated 6/18/2009 6:32:12 P.M. Eastern Daylight Time,  keith.mckinley(at)townisp.com writes:

  

 I'll put in my view on this and other subjects.

  

 I've owned my CJ some 15 years now.  Going for the extra fuel is one  of the best things I did to my plane.  If you do long XC occasionally you  find it more comfortable having the gas on board for reserve.  I flew the  airlines for 34 years, believe me being short on gas is not a comfortable  feeling.  Than again "short on gas" is individual perception.  I did  not enjoy using the VFR fuel minimums and landing with thirty minutes of  fuel.  You have less alternatives and few places to divert  to.  Now I feel quite comfortable with an one hour plus reserve after  my normal 2 hour legs.  BTW you can adjust the fuel senders in the tank to  read very accurately at the low end of the scale, which for me, is when you  really want to know what's left in the tank.  

  

 Airports,

  

 Been to Allen home at SEE for a party one time while out flying the  B-24.  VERY NICE!!!  It would be interesting to know what kind of deal  was made for his set up.

  

 We just finished (today) resurfacing our runway here on our airpark  (FD44).  Basically we remove the top soil, graded, put on a limestone/clay  base, and re sod the whole runway with a tough hybrid grass used for golf  fairways.  In 3 weeks time, she'll be ready for use. The nice thing  about this, we didn't have to get permission or OKs from anyone.  Only  fighting was amongst the different homeowners in the association.

  

 BTW I'm now home for a while.  Dropped 11 250lb bombs on 2 missions in  the B-24.  Heard the rattle of a 50cal from my waist gun position as I flew  the IP to drop point.  Had a P-51C for escort.  I discovered that I  have claustrophobia while setting in and working the belly  turret.  Believe me gentleman there is nothing like it except the real  thing and this is the closest I'll ever be able to get.

  

 Jim "Pappy" Goolsby

  

  

 --> Yak-List message posted by: "keithmckinley"  <keith.mckinley(at)townisp.com>



I'm finding that after a year of  ownership that there are very few modifications worth doing on an airplane  that's been around a while.  Seems  that if there was a better way the  Chinese probably would have done it. 



The few mods that I have; oil  filter, auto spark plug kit, air filter and intake drain seem like no brainers.  Messing with an otherwise decent fuel system is probably not worth the effort.  Time and money probably would be better spent on a FF  system.



Keith



--------

Keith McKinley

700  HS

KFIT

 Download the AOL Classifieds Toolbar for local deals at your fingertips.

  [quote][b]

viperdoc(at)mindspring.co
Guest

Posted: Thu Jun 18, 2009 7:20 pm Post subject: CJ fuel sending unit

. 

better spent on a FF system.



Keith



What's a FF system. Agree with all said in your post. Just curious what is a

FF system before the imagination runs wild.

Doc

keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Thu Jun 18, 2009 7:31 pm Post subject: Re: CJ fuel sending unit

Doc,



I shouldn't have said "system"... I was referring to a fuel flow transducer and display unit



Keith

viperdoc(at)mindspring.co
Guest

Posted: Fri Jun 19, 2009 5:58 am Post subject: CJ fuel sending unit

Copy.

Doc



--

ChangDriver

Joined: 15 Sep 2007
Posts: 266

Posted: Fri Jun 19, 2009 8:13 am Post subject: Re: CJ fuel sending unit

Keith:



It is possible with one very long cap probe that is bent just right and worked thru the baffles and never contacts the tank.  Probably only doable in theory.



The other way is to do multiple straight capacitive probes in the tank (probably 2 would do it) and wire them in a summed probe configuration.  One would go in the low end of the tank and the other in the high end.  They would have to mount from the top and go down.  To get clearance from the wing skin, you'd also have to recess them.  It would take a bit of tank fabrication to do this.  My opinion is this is a waste of time for the stock tanks as the sending units are typically very accurate.



For either capacitive probe configuration, you'd need to change the gauge as well.



Either install the Worlwide Warbird tanks, Gill's bladder tanks, do the Air Victoria mod, or install Doug Sapp's tanks if you want extra capacity.  If you want a ton of capacity, add Doug's tanks and the WW tanks!



To just manage fuel better, a fuel flow system that is wired to a GPS and installing rudder trim would be the best bet.



Regards,



Craig W

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