Fuel System modeling

[Zeagle]

I have watched your excellent videos including the interview with the T-33 pilot. However, I think either he misspoke about the fuel system or maybe his bird has been modified in some way.

According to the T-33A manual, AN 01-75FJC-1, dated 15 May, 1950, revised 24 April, 1951, the T-33A tip tanks, LE tanks, and wing tanks are fed into the main tank via a set of float valves staged at different heights. This allows the main tank to draw from the tip tanks first,  LE tanks second, wing tanks third, and finally the main fuselage tank. Fuel does not vent overboard if all the tank pumps are selected on (see diagram figure 1-3, page 5). 

According to figure 2-1, page22, As the fuselage tank level drops, the float valves open in succession until all the tanks are emptied. The suggestion is to turn "off" the pump for a specific tank as it's respective low fuel alert light comes on.

Another interesting note is the use of 100/130 gasoline in the LE tanks used for starting and purging during shutdown.

I hope you guys continue to update this bird. She looks and flies amazing. 

 

Sincerely, 

Patrick "Zeagle" Duncan

[Zeagle]

Also, in AN 01-75FJC-1, paragraph 2-11, page 20, Fuel System Management, it states that the normal sequence of fuel tank use is

For J33-A-23 engines

a. Leading edge tanks for starting, with fuselage tank bypassed.

b. after starting, turn on tip, wing, and fuselage tanks with leading edge tanks off.

c. Take-off on fuselage tank only, all other tanks off.

d. Leading edge tanks for purging prior to stopping engine.

 

For J33-A-35 engines and modified J35-A-23 engines

a. All tanks on for starting and taxi

b. Take-off on fuselage tank only

c. All tanks on after takeoff

 

 

[CF104]

On 12/11/2024 at 4:42 PM, Zeagle said:

I have watched your excellent videos including the interview with the T-33 pilot. However, I think either he misspoke about the fuel system or maybe his bird has been modified in some way.

According to the T-33A manual, AN 01-75FJC-1, dated 15 May, 1950, revised 24 April, 1951, the T-33A tip tanks, LE tanks, and wing tanks are fed into the main tank via a set of float valves staged at different heights. This allows the main tank to draw from the tip tanks first,  LE tanks second, wing tanks third, and finally the main fuselage tank. Fuel does not vent overboard if all the tank pumps are selected on (see diagram figure 1-3, page 5). 

According to figure 2-1, page22, As the fuselage tank level drops, the float valves open in succession until all the tanks are emptied. The suggestion is to turn "off" the pump for a specific tank as it's respective low fuel alert light comes on.

Another interesting note is the use of 100/130 gasoline in the LE tanks used for starting and purging during shutdown.

I hope you guys continue to update this bird. She looks and flies amazing. 

 

Sincerely, 

Patrick "Zeagle" Duncan

 

Sorry to say but you're wasting your time. I've gone through all of this with the initial release for MSFS 2020. INI is totally silent when presented with factual documented evidence. They even reposted the 'how to prevent fuel venting' video for 2024 which is completely wrong for any T-33 ever built. I used to work on the CT-133 (Canadian version) and they don't seem to appreciate input from users with real world experience. There's also a lot wrong with the engine fuel burn and indications.

Here's a link to entertain you regarding the fuel system on the MSFS 2020 version.

https://forum.inibuilds.com/topic/23761-quick-question-on-the-fuel-system-coding/

Cheers,

John