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  #11  
Old 07-04-2022, 06:28 PM
PaulvS's Avatar
PaulvS PaulvS is offline
 
Join Date: Aug 2019
Location: Western Australia
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Default Fuel line

While you're at it also check the fuel line that leads to the red cube - in the photo it appears as if the bend is kinked and a bit flattened and has a slight dent, possibly from when the line was temporarily removed to insert the test gauge.
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  #12  
Old 07-05-2022, 08:39 AM
pv9 pv9 is offline
 
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Location: San Jose
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Good catch! They pushed the fuel lines apart to make room for the gauge and slightly bent the hose.
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  #13  
Old 07-05-2022, 08:51 AM
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mburch mburch is offline
 
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And while you're down there... maybe it's just the angle of the photo, but it looks like the fuel flow transducer is just hanging in space, supported only by the fuel lines connected to it. If that's the case, I'd worry about something cracking eventually.
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  #14  
Old 07-05-2022, 09:45 AM
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Carl Froehlich Carl Froehlich is offline
 
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Location: Dogwood Airpark (VA42)
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If you are going to rework the red cube, then use the opportunity to move it to a better location. I suggest just after the mechanical fuel pump, using adel clamps to mount it on the engine mount - not the engine.

Follow the normal rules - no right angle fittings, fuel line on the output side running slightly up hill, etc.

Carl
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  #15  
Old 07-05-2022, 11:21 AM
pv9 pv9 is offline
 
Join Date: Feb 2022
Location: San Jose
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I was told not to put the fuel pressure transducer or the boost pump in the engine compartment due to the heat generated by the exhaust. Is that just hearsay?
Thank you.
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  #16  
Old 07-05-2022, 11:45 AM
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Carl Froehlich Carl Froehlich is offline
 
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Location: Dogwood Airpark (VA42)
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Typical install is the boost pump and fuel selector on the cabin side of the firewall. Fuel filter may or may not be.

Fuel flow sender on the engine side of the firewall, between the mechanical fuel pump and the engine. Fuel pressure sender on the firewall, tapped into the output of the mechanical fuel pump.

Carl
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  #17  
Old 07-05-2022, 12:06 PM
pv9 pv9 is offline
 
Join Date: Feb 2022
Location: San Jose
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Quote:
Originally Posted by Carl Froehlich View Post
Typical install is the boost pump and fuel selector on the cabin side of the firewall. Fuel filter may or may not be.

Fuel flow sender on the engine side of the firewall, between the mechanical fuel pump and the engine. Fuel pressure sender on the firewall, tapped into the output of the mechanical fuel pump.

Carl
Looks like everything is as you suggested except the fuel pressure sender which should be relocated outside. The boost pump is on the cabin side.
Thank you for spotting that.
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  #18  
Old 07-05-2022, 01:07 PM
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Carl Froehlich Carl Froehlich is offline
 
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Quote:
Originally Posted by pv9 View Post
Looks like everything is as you suggested except the fuel pressure sender which should be relocated outside. The boost pump is on the cabin side.
Thank you for spotting that.
Nope - looking at your photo your fuel flow sender (red cube) is on the cabin side of the firewall, not mounted at all - the photo suggest it is suspended just by the fuel lines. That alone is a fuel leak waiting to happen.

Carl
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  #19  
Old 07-05-2022, 01:49 PM
pv9 pv9 is offline
 
Join Date: Feb 2022
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Thank you. The cube was a recent addition by an A&P and I will be sure to relocate it on the other side of the firewall.

I've grounded the aircraft and am going through pretty much everything with a fine tooth comb at this point.
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  #20  
Old 07-05-2022, 05:22 PM
Stevea Stevea is offline
 
Join Date: Jun 2008
Location: San Jose, CA
Posts: 237
Default fuel system schematic

Quote:
Originally Posted by pv9 View Post
Thank you. The cube was a recent addition by an A&P and I will be sure to relocate it on the other side of the firewall.

I've grounded the aircraft and am going through pretty much everything with a fine tooth comb at this point.
Sent you a PM with my fuel system schematic for a reference. Your system should be the same since we both have carb'd engines.
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