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  #1  
Old 01-13-2016, 03:58 PM
Darren S Darren S is offline
 
Join Date: Apr 2009
Location: Canada
Posts: 439
Default High fuel pressure weirdness ???

I have no idea what's going on?

About 2 months ago, upon start up, the fuel pressure reading was unusually high. Like 45 psi. As the engine warmed and I headed to the run up area, the pressure suddenly dropped to the normal value of 23. Flights have been fine. No issues. Boost pump on or off makes no difference.

Every time I start up the same thing occurs. High fuel pressure for 5 min., as things warm it suddenly drops. Yesterday it was up to 65 psi for 5 min, then the sudden drop to 23.

I've had the -7 for 5 years. Been through 5 winters, it's a Superior IO-360 fuel injected engine. 1100 hours.

It only concerns me because its somethings "different" than before.

Any ideas what to check? Is something blocked? Ice that melts? Ideas??

Thanks

Darren
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  #2  
Old 01-13-2016, 04:12 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
Default

Your sender is most likely going bad. Replace it.

Carl
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  #3  
Old 01-13-2016, 06:05 PM
jakej jakej is offline
 
Join Date: Aug 2005
Location: Adelaide, Australia
Posts: 129
Default

If it's the VDO unit (failures common) then replace with Kavlico unit from Dynon.
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  #4  
Old 01-13-2016, 09:29 PM
Darren S Darren S is offline
 
Join Date: Apr 2009
Location: Canada
Posts: 439
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Ok thanks for the suggestions. I fly Advanced and I didn't build the bird so I'm heading out to the hanger tomorrow to see if I can locate the offending fuel pressure sender
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  #5  
Old 01-13-2016, 09:38 PM
Jesse's Avatar
Jesse Jesse is offline
 
Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,679
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Quote:
Originally Posted by Carl Froehlich View Post
Your sender is most likely going bad. Replace it.

Carl
What he said.
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Jesse Saint
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  #6  
Old 01-14-2016, 06:27 AM
texdog texdog is offline
 
Join Date: Jan 2013
Location: Fredericksburg, Tx.
Posts: 320
Question Kavlico

Which Kavlico fuel pressure sensor should be used on a 0-360 Lycoming?
Thanks,
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ATP/FE/CFI 10 Type Ratings.
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  #7  
Old 01-14-2016, 06:33 AM
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Jesse Jesse is offline
 
Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,679
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Quote:
Originally Posted by texdog View Post
Which Kavlico fuel pressure sensor should be used on a 0-360 Lycoming?
Thanks,
0-15 PSI for a carbureted engine.
0-50 PSI for injected.
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  #8  
Old 01-14-2016, 02:09 PM
texdog texdog is offline
 
Join Date: Jan 2013
Location: Fredericksburg, Tx.
Posts: 320
Smile Fuel pressure

Thanks Jesse!
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T82 Fredericksburg,Tx.
Don't make easy hard!
Master Pilot Award
RV6A owner N6711
L19 sold
ATP/FE/CFI 10 Type Ratings.
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  #9  
Old 01-14-2016, 02:59 PM
Tom Martin Tom Martin is offline
 
Join Date: Jan 2005
Location: Ontario, Canada
Posts: 1,544
Default

It could also be a grounding issue. Take a hose clamp and fasten the bare end of the wire against the sender body. Ground the other end to the airframe somewhere suitable.
It is likely the sensor but try the wire first. I have a wire on the fuel sensor on my rocket and it has worked for 5 or six years?
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Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger

Fairlea Field
St.Thomas, Ontario Canada, CYQS
fairleafield@gmail.com
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  #10  
Old 01-14-2016, 03:47 PM
Darren S Darren S is offline
 
Join Date: Apr 2009
Location: Canada
Posts: 439
Default

The fuel pressure sender was cheap enough. I just ordered one from AFS. Sounds like it's an item that needs changing once in awhile. It's been 10 years and 1100+ hours.

Recently my flap switch went belly up, as did my aileron trim relay. These things just don't last forever and the vibration kills prematurely.

Thanks for the help
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