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  #1  
Old 06-24-2021, 08:05 PM
Alchemist Alchemist is offline
 
Join Date: Mar 2014
Location: Glasgow, KY
Posts: 173
Default Fuel Pressure Saga

I have an RV6-A with a lyc d1a engine. I've started to notice some low fuel pressure readings on my gauge 2 PSI at 2400rpm. I also notice that when I put my boost pump on I see no change in fuel pressure. I know that my boost pump works as I tested the flow and you can notice the difference in sound when it starts developing some head pressure. I am curious on what the best practice and procedures are for identifying a bad gauge or sending unit ?

I have an electric boost pump, engine driven fuel pump, and up draft carb.

Fuel Pressure Gauge is a Modular Mitchell aircraft products
Sending unit is a PS-211-9000

Thanks in advance!
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  #2  
Old 06-24-2021, 08:11 PM
Alchemist Alchemist is offline
 
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  #3  
Old 06-24-2021, 08:44 PM
dothetime dothetime is offline
 
Join Date: Jul 2015
Location: Boynton Beach, Florida
Posts: 175
Default Pressure

I had the same problem, after checking every hose clamp I put a mechanical pressure gauge on my line going into the carb and found normal pressure
It was my sending unit
Put another one in and my pressure was fine
Donít know if thatís your problem, but I would check that first.
Dave
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  #4  
Old 06-24-2021, 08:58 PM
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PaulvS PaulvS is offline
 
Join Date: Aug 2019
Location: Western Australia
Posts: 713
Default Wire connection

Quote:
Originally Posted by Alchemist View Post
Pics below
Looking at he second photo of the sender:- it appears like the terminal on the left is bent about 90 degrees, so maybe start with checking those two crimped connectors as well as the tabs. It also seems like there may be some surface corrosion due to humidity or ? around that area, so cleaning the connections could help.
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  #5  
Old 06-25-2021, 06:17 AM
TS Flightlines TS Flightlines is offline
 
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Location: Ridgeland, SC
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Default

Justin, many threads here on pressure indications. Grab a known good mechanical gauge and plumb it in the hose before the sender. That way you can see BOTH the sender and mechanical gauge readings. If they read the same, check the pumps, both the boost and mechanical, the plumbing for a possible restriction, especially if rubber lined hoses are used.
If they read differently with the test gauge closer to 'normal" specs, then sender or possibly a wiring/terminal/ground/power thing.

Tom
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  #6  
Old 06-25-2021, 07:51 AM
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bjdecker bjdecker is offline
 
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Quote:
Originally Posted by Alchemist View Post
Pics below
Picture #2 says it all -- You should re-terminate both of those connectors with Tyco/AMP PIDG FASTON terminations. DO NOT USE CHEAP/AUTOMOTIVE TERMINATIONS

https://www.mouser.com/ProductDetail...4klptmAQ%3D%3D
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  #7  
Old 06-25-2021, 06:59 PM
Alchemist Alchemist is offline
 
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Location: Glasgow, KY
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So I checked it with a mechanical gauge and it read 3 psi with engine driven pump and with the electric boost pump it went to 5 psi. Iím going to check the wires and terminals tomorrow before ordering a new sender.
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  #8  
Old 06-26-2021, 10:10 AM
dothetime dothetime is offline
 
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Location: Boynton Beach, Florida
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Default Pressure

Your welcome
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  #9  
Old 06-26-2021, 01:29 PM
BH1166 BH1166 is offline
 
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Location: Eatonton Georgia
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Justin, pressure senders are the Achilles heel on my 6A / d1a. My 2 cents worth is .5 is lowest Iíll accept, and I always suspect the sender when pressure reads too high. Each have their comfort level on this.
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  #10  
Old 06-26-2021, 02:45 PM
Cth6 Cth6 is offline
 
Join Date: Apr 2017
Location: Central Florida
Posts: 155
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Quote:
Originally Posted by Alchemist View Post
So I checked it with a mechanical gauge and it read 3 psi with engine driven pump and with the electric boost pump it went to 5 psi. Iím going to check the wires and terminals tomorrow before ordering a new sender.
Justin, let us know what you find when you run the wires down. Have a similar issue I am troubleshooting. Mechanical gauge to test against should be here next week
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