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  #1  
Old 01-23-2023, 03:54 PM
Aviacionlight Aviacionlight is offline
 
Join Date: Jul 2022
Location: Laredo TX
Posts: 10
Default Failure on first start of the day

Hi everyone, i`m experiencing a failure on the first engine starting attempt (rotax 912 uls) on cold engine.

This is what happens at first start.

-Disconnect battery from solar battery charger and maintainer
-Turn proppeler for oil check
-Turn EFIS on
-Master on (electric fuel pump on)
-Ignition both
-Choke
-Ignition key.... the prop just move a couple of inches folowed by a rattling noise (in the firewall) and the electric fuel pump fuse blows.

30 seconds later.

-Second start attempt (with electric fuel pump off, fuse blown)
-Ignition both
-Ignition Key
-SUCCESSFUL IGNITION the engine turns on and runs as normal.

After the engine starts you can restart it without trouble as many times as you want thru the day with the electric fuel pump on

The battery is allways full charged (anyway i perform a load test and it is in very good condition) the plane flyes twice a week.
The rattling noise is from the starter solenoid, or from the master solenoid?

Does anyone have an idea what`s going on before i remove the starter?
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  #2  
Old 01-23-2023, 04:04 PM
GatorsR1's Avatar
GatorsR1 GatorsR1 is offline
 
Join Date: Jul 2018
Location: Owens Cross Roads, AL
Posts: 99
Default

Possibly a weak battery.
I had same symptoms.
Replacing the battery solved that issue in my 12.
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RV12 dream machine #120764
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  #3  
Old 01-23-2023, 04:39 PM
Avanza Avanza is offline
 
Join Date: Jul 2020
Location: Vastervik Sweden
Posts: 226
Smile Starting problem

There is probably no problem with master solenoid.
How old is the battery ?
You could try to start the engine with a good supporting battery.
If the problem is still there, you know itīs not the battery.
If the engine starts, replace the battery.
It could be the starter solenoid that gives the rattling noise.
How old is the starter solenoid ?

Good luck
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  #4  
Old 01-23-2023, 06:09 PM
Aviacionlight Aviacionlight is offline
 
Join Date: Jul 2022
Location: Laredo TX
Posts: 10
Default

Quote:
Originally Posted by Avanza View Post
There is probably no problem with master solenoid.
How old is the battery ?
You could try to start the engine with a good supporting battery.
If the problem is still there, you know itīs not the battery.
If the engine starts, replace the battery.
It could be the starter solenoid that gives the rattling noise.
How old is the starter solenoid ?

Good luck
The battery is 6 years old, 360 hrs on solenoid
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  #5  
Old 01-23-2023, 06:10 PM
Aviacionlight Aviacionlight is offline
 
Join Date: Jul 2022
Location: Laredo TX
Posts: 10
Default

Quote:
Originally Posted by GatorsR1 View Post
Possibly a weak battery.
I had same symptoms.
Replacing the battery solved that issue in my 12.
Will be the next thing to do.

Thanks
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  #6  
Old 01-26-2023, 03:51 PM
Aviacionlight Aviacionlight is offline
 
Join Date: Jul 2022
Location: Laredo TX
Posts: 10
Default

Hi,

The problem was solved with a new battey, from now on I will no longer trust in the load battery test.... the best way to do it is step by step starting with the most obvious.

Thanks.
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  #7  
Old 01-26-2023, 05:57 PM
GatorsR1's Avatar
GatorsR1 GatorsR1 is offline
 
Join Date: Jul 2018
Location: Owens Cross Roads, AL
Posts: 99
Default another feather in Occam's cap

the simplest explanation is usually the correct one
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RV12 dream machine #120764
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