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  #1  
Old 08-31-2014, 05:02 PM
bjohnson1234 bjohnson1234 is offline
 
Join Date: Oct 2012
Location: Scottsdale, AZ
Posts: 150
Default Engine quit on takeoff rollout

This morning after a normal run-up my engine quit on takeoff rollout with full throttle and mixture on my Superior XP-360. A few weeks ago I did some maintenance including repairing my air box (the filter had worn through the fiberglass) and installing the "poor man's cold air induction" from Flyboyz (http://www.flyboyaccessories.com/Poo...tem-p/2107.htm). When I took the air box off I cleaned some of the build-up off the inside of the fuel injection servo with some carb cleaner. All gaskets on the induction were scraped clean and replaced with new ones. I did a test flight a week ago and didn't notice any issues during a few laps in the pattern.

On the ground after the failure I noticed a few things:
1. Briefly going to full throttle and then idle caused the engine to quit
2. Fuel pressure would sometimes drop to between 8 and 10 PSI. The boost pump restored pressure to 24-25 and it would stay around 22 when I turned it off, but it would sometimes drop back down when increasing the throttle
3. Engine would sometimes stumble when changing throttle settings. Boost pump made no difference even when non-boost pressure was low
4. Idle was smooth
5. Engine ran smooth at constant throttle, high or low

After double-checking the intake and looking for any other obvious issues, I did a high-speed taxi which ended up turning into a takeoff. The engine ran smooth for a while, but at one point felt like it was losing power on the climb. Anyone have any ideas of what the problem might be? Anyone around DVT that could help me out with it? Thanks.
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  #2  
Old 08-31-2014, 05:45 PM
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curtis curtis is offline
 
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Location: Kansas
Posts: 384
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What was the OAT and what type of fuel are you burning? Sounds sort of like vapor lock?
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Last edited by curtis : 08-31-2014 at 05:51 PM.
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  #3  
Old 08-31-2014, 05:53 PM
bjohnson1234 bjohnson1234 is offline
 
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Location: Scottsdale, AZ
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Quote:
Originally Posted by curtis View Post
What was the OAT and what type of fuel are you burning? Sounds sort like vapor lock?
About 100 degrees running 100LL. I've certainly flown in hotter conditions in Phoenix. Vapor lock could explain the takeoff roll quit, but not the other issues. I was able to restart the engine after it quit. I also thought about water in the fuel because I just washed it, but I checked the fuel drains after washing it and then again after filling up the tanks.
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  #4  
Old 08-31-2014, 06:27 PM
jimbo jimbo is offline
 
Join Date: Apr 2006
Location: Howell, MI
Posts: 297
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I would check the fuel screen whether you have a gascollator or fuel filter. And fuel pickup screens in gas tanks.

I remember reading a thread several months back were a guy was having intermittent engine problems. He couldn't find anything after checking this and that so he went flying. We'll his luck ran out one day right after takeoff and severely damaged the plane with an off field landing.

If memory serves me correctly he found his gas tank pickup tubes blocked starving engine of fuel.

Fuel for thought,
Jim
RV9a
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  #5  
Old 08-31-2014, 06:34 PM
bjohnson1234 bjohnson1234 is offline
 
Join Date: Oct 2012
Location: Scottsdale, AZ
Posts: 150
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I'm going to check all the filters/screens and check for any fuel leaks tomorrow. What about a hardened/cracked injection servo diaphragm? The engine only has about 200 hours on it, but I don't know how old the actual servo is.
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  #6  
Old 08-31-2014, 06:50 PM
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az_gila az_gila is offline
 
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Location: 57AZ - NW Tucson area
Posts: 10,011
Question

A possible small leak on the "suck" side of the fuel system?
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  #7  
Old 08-31-2014, 06:56 PM
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Walt Walt is offline
 
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Location: Dallas/Ft Worth, TX
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Quote:
Originally Posted by bjohnson1234 View Post
After double-checking the intake and looking for any other obvious issues, I did a high-speed taxi which ended up turning into a takeoff. The engine ran smooth for a while, but at one point felt like it was losing power on the climb. Anyone have any ideas of what the problem might be? Anyone around DVT that could help me out with it? Thanks.
You should ground the aircraft and find someone qualified to help you sort this out before you become a statistic
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  #8  
Old 08-31-2014, 07:44 PM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
Posts: 6,797
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I would check to see of your cleaning left gunk partially clogging the pressure sensing port in the venturi area.
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  #9  
Old 08-31-2014, 07:58 PM
bjohnson1234 bjohnson1234 is offline
 
Join Date: Oct 2012
Location: Scottsdale, AZ
Posts: 150
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Quote:
Originally Posted by BobTurner View Post
I would check to see of your cleaning left gunk partially clogging the pressure sensing port in the venturi area.
I was initially leaning towards an issue with the injection servo and there could be more than one thing going on here so it's still something worth checking, but that wouldn't cause the low fuel pressure reading. I'm going to dump my engine data into savvy analysis tomorrow and see if there is any useful information there.
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  #10  
Old 08-31-2014, 08:07 PM
bjohnson1234 bjohnson1234 is offline
 
Join Date: Oct 2012
Location: Scottsdale, AZ
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Quote:
Originally Posted by az_gila View Post
A possible small leak on the "suck" side of the fuel system?
What is the best way to test that?
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