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Fuel pressure sender problem

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saolesen(at)sirentel.net
Guest

Posted: Tue Nov 09, 2010 7:23 pm Post subject: Fuel pressure sender problem

While getting ready to land in IA after a trip to FL my fuel pressure went up to 111. The FP went up about the time the time I hit the electric boost pump.  With the red lights flashing, the engine ran normally and an uneventful landing was made.  I thought that maybe a ground wire had become intermittent and that was the cause of the problem.  During take-off the lights came back on and finally went out during the cruise portion of the flight to WI.  The FP light did not come back on when I landed with the boost pump on at my home airport. 



I  checked into the problem after I got home.  The sender came with the GRT  EIS.  The ground wire is secure.  The sender tests at 7 ohms with no pressure and around 720 ohms with the boost pump on.  Does anyone have any insight as to what is going on with the fuel pressure?  Is there a way the sender can become intermittent?

Thanks,



Sheldon Olesen

N475PV  237 hours

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dave.saylor.aircrafters(a
Guest

Posted: Tue Nov 09, 2010 8:06 pm Post subject: Fuel pressure sender problem

I had a similar intermittent problem with my oil temp probe.  It would

vary +/- 50F in a few seconds, which I don't think is physically

possible.  I put a ground wire between the oil temp sender housing and

the firewall and that eliminated the problem.  That was two years ago.



This summer the problem returned so I remade the ground and the

terminal connection on the probe, and everything returned to normal.



I'd make sure all the grounds and connections are solid and see what it does.



Dave Saylor

AirCrafters

140 Aviation Way

Watsonville, CA 95076

831-722-9141 Shop

831-750-0284 Cell



On Tue, Nov 9, 2010 at 7:16 PM, Sheldon Olesen <saolesen(at)sirentel.net> wrote:

 	  Quote: 	
		   



 While getting ready to land in IA after a trip to FL my fuel pressure went up to 111. The FP went up about the time the time I hit the electric boost pump. Â With the red lights flashing, the engine ran normally and an uneventful landing was made. Â I thought that maybe a ground wire had become intermittent and that was the cause of the problem. Â During take-off the lights came back on and finally went out during the cruise portion of the flight to WI. Â The FP light did not come back on when I landed with the boost pump on at my home airport.



 I Â checked into the problem after I got home. Â The sender came with the GRT Â EIS. Â The ground wire is secure. Â The sender tests at 7 ohms with no pressure and around 720 ohms with the boost pump on. Â Does anyone have any insight as to what is going on with the fuel pressure? Â Is there a way the sender can become intermittent?

 Thanks,



 Sheldon Olesen

 N475PV Â 237 hours

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carl.froehlich(at)verizon
Guest

Posted: Wed Nov 10, 2010 3:55 am Post subject: Fuel pressure sender problem

An identical problem with a friend's GRT install.  His sending transducer went bad. 


Assuming your wiring checks out, call the good folks at Grand Rapids and order a new part.


Carl


Sent from my mobile phone.Â Â  Please read past the typos.


-----Original message-----

From: Sheldon Olesen <saolesen(at)sirentel.net>

To: rv10-list(at)matronics.com

Sent: Wed, Nov 10, 2010 03:16:08 GMT+00:00

Subject: RV10-List: Fuel pressure sender problem




While getting ready to land in IA after a trip to FL my fuel pressure went up to 111. The FP went up about the time the time I hit the electric boost pump.  With the red lights flashing, the engine ran normally and an uneventful landing was made.  I thought that maybe a ground wire had become intermittent and that was the cause of the problem.  During take-off the lights came back on and finally went out during the cruise portion of the flight to WI.  The FP light did not come back on when I landed with the boost pump on at my home airport. 


I  checked into the problem after I got home.  The sender came with the GRT  EIS.  The ground wire is secure.  The sender tests at 7 ohms with no pressure and around 720 ohms with the boost pump on.  Does anyone have any insight as to what is going on with the fuel pressure?  Is there a way the sender can become intermittent?



Thanks,


Sheldon Olesen

N475PV  237 hours

- The Matronics RV10-List Email Forum -

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Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Wed Nov 10, 2010 4:45 am Post subject: Fuel pressure sender problem

Hmm, we have heard of problems with GRT EGT probes, now fuel pressure

sending unit. Makes one wonder if GRT engine probes are up to the

task. Are other EFIS vendor's probes more durable?



On Wed, Nov 10, 2010 at 4:52 AM, carl.froehlich(at)verizon.net

<carl.froehlich(at)verizon.net> wrote:

 	  Quote: 	
		   An identical problem with a friend's GRT install.  His sending transducer

 went bad.



 Assuming your wiring checks out, call the good folks at Grand Rapids and

 order a new part.



 Carl


	


 	  Quote: 	
		   -----Original message-----



 From: Sheldon Olesen <saolesen(at)sirentel.net>

 To: rv10-list(at)matronics.com

 Sent: Wed, Nov 10, 2010 03:16:08 GMT+00:00

 Subject: Fuel pressure sender problem



 



 While getting ready to land in IA after a trip to FL my fuel pressure went

 up to 111. The FP went up about the time the time I hit the electric boost

 pump. With the red lights flashing, the engine ran normally and an

 uneventful landing was made.

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

carl.froehlich(at)verizon
Guest

Posted: Wed Nov 10, 2010 5:37 am Post subject: Fuel pressure sender problem

I have the GRT on my 8A,  but using Dynon on the 10.  I note the fuel senders are very similar on both (standard automotive).


So to your question, I would guess the infrequent problems like this are not systematic to one system over another.  


Carl


Sent from my mobile phone.Â Â  Please read past the typos.


-----Original message-----

From: Kelly McMullen <apilot2(at)gmail.com>

To: rv10-list(at)matronics.com

Sent: Wed, Nov 10, 2010 12:42:24 GMT+00:00

Subject: Re: RV10-List: Fuel pressure sender problem




Hmm, we have heard of problems with GRT EGT probes, now fuel pressure

sending unit. Makes one wonder if GRT engine probes are up to the

task. Are other EFIS vendor's probes more durable?


On Wed, Nov 10, 2010 at 4:52 AM, carl.froehlich(at)verizon.net

<carl.froehlich(at)verizon.net> wrote:

 	  Quote: 	
		   An identical problem with a friend's GRT install.Â  His sending transducer

 went bad.


 Assuming your wiring checks out, call the good folks at Grand Rapids and

 order a new part.


 Carl

	


 	  Quote: 	
		   -----Original message-----


 From: Sheldon Olesen <saolesen(at)sirentel.net>

 To: rv10-list(at)matronics.com

 Sent: Wed, Nov 10, 2010 03:16:08 GMT+00:00

 Subject: RV10-List: Fuel pressure sender problem


 


 While getting ready to land in IA after a trip to FL my fuel pressure went

 up to 111. The FP went up about the time the time I hit the electric boost

 pump. With the red lights flashing, the engine ran normally and an

 uneventful landing was made.

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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dmaib(at)mac.com
Guest

Posted: Wed Nov 10, 2010 5:41 am Post subject: Fuel pressure sender problem

I had the identical problem about a year ago. Talked to Sandy at GRT  

and she said I needed a new fuel pressure transducer. That fixed the  

problem. She indicated that this was a fairly common issue.



David Maib

40559

Flying

On Nov 9, 2010, at 10:16 PM, Sheldon Olesen wrote:






While getting ready to land in IA after a trip to FL my fuel pressure  

went up to 111. The FP went up about the time the time I hit the  

electric boost pump.  With the red lights flashing, the engine ran  

normally and an uneventful landing was made.  I thought that maybe a  

ground wire had become intermittent and that was the cause of the  

problem.  During take-off the lights came back on and finally went  

out during the cruise portion of the flight to WI.  The FP light did  

not come back on when I landed with the boost pump on at my home  

airport.



I  checked into the problem after I got home.  The sender came with  

the GRT  EIS.  The ground wire is secure.  The sender tests at 7 ohms  

with no pressure and around 720 ohms with the boost pump on.  Does  

anyone have any insight as to what is going on with the fuel  

pressure?  Is there a way the sender can become intermittent?

Thanks,



Sheldon Olesen

N475PV  237 hours

- The Matronics RV10-List Email Forum -

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rene(at)felker.com
Guest

Posted: Wed Nov 10, 2010 6:27 am Post subject: Fuel pressure sender problem

I had a similar problem.......I ordered a new sender, but it ended up being

the ground wire.



130 hours, or so and no real probe problems for me.



Rene' Felker

N423CF

801-721-6080

--

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dlm46007(at)cox.net
Guest

Posted: Wed Nov 10, 2010 6:38 am Post subject: Fuel pressure sender problem

I switched to EI probes ( they claim 2000 hours); the problem with alternate 

probes seems to be that the GRT harness must be expended and even though 

using the same material the length changes the resistance and the probes 

register significantly different temperatures. After leaning I use the 

normalization function to monitor any changes. I have three extended leads 

and three /EGTs that differ by more than 150F difference from the others. 

They still peak at the same fuel flows but the peak temperatures are 

different. Prior to installing the EI EGT probes I had replaced 3 0r 4? GRT 

probes in less than 300 hours. So far the fuel/oil transducers and have 

functioned properly.

---

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