How to vent custom fuel tank

[fmforbes]

I have been working on a large ship. But for some reason, once it gets below a half tank the engines die (It kept dying at 17000L). I added an air filter and vented the tank and I managed to get to 16000L before the engine dies... but my fuel economy went way down. I even added a hatch to see if opening that would equalise the pressure but the engine wont restart after it dies.

If anyone has any ideas on how to fix it, it would be much appreciated. Ill upload the file shortly.

[fmforbes]

https://steamcommunity.com/sharedfiles/filedetails/?id=3206947661

[Ninja]

Getting the same issue, the gas system is so utterly useless, I have returned to this game after some time and the changes are the most ridiculous I have ever seen in a game.

If anyone can offer assistance on this it would be appreciated.

[Captain]

I love the gas system. All you need to do is put a gas relief valve and a fluid port. That's it. Just like real life fluid systems, they need gas relief valves. They are in your car, in airplanes, in train cars. Gas relief ports are in most fluid systems.

[GrumpyOldMan]

Originally posted by Captain:

I love the gas system. All you need to do is put a gas relief valve and a fluid port. That's it. Just like real life fluid systems, they need gas relief valves. They are in your car, in airplanes, in train cars. Gas relief ports are in most fluid systems.

Did you do any fluid trading recently? (Oil/Diesel etc.)

[fmforbes]

I've added a gas relief valve, but the same issues persists. Maybe it is something else or I installed it wrong, but I am all out of ideas.

Heres the updated version with the fuel vent.
https://steamcommunity.com/sharedfiles/filedetails/?id=3207246550

[Captain]

Originally posted by GrumpyOldMan:

Originally posted by Captain:

I love the gas system. All you need to do is put a gas relief valve and a fluid port. That's it. Just like real life fluid systems, they need gas relief valves. They are in your car, in airplanes, in train cars. Gas relief ports are in most fluid systems.

Did you do any fluid trading recently? (Oil/Diesel etc.)

Just ran a test. 29,015 L. Pumped into the diesel sell on Donnkk. Took 13.31 minutes. Seems Reasonable to me.

[Captain]

Originally posted by fmforbes:

I've added a gas relief valve, but the same issues persists. Maybe it is something else or I installed it wrong, but I am all out of ideas.

Heres the updated version with the fuel vent.
https://steamcommunity.com/sharedfiles/filedetails/?id=3207246550

You added a gas relief valve but, did not put a fluid port on the end. So nothing is going to happen. You need a fluid port on the end of the relief valve. https://i.imgur.com/GMT6T2c.png Your valve

[Wingnut]

Dont forget to put in a one way valve (or a pump) with the gas relief valve or the tank will suck air in as well.

[GrumpyOldMan]

Originally posted by Captain:

Just ran a test. 29,015 L. Pumped into the diesel sell on Donnkk. Took 13.31 minutes. Seems Reasonable to me.

So 35l/s? Seems rather abysmal considering 450l/s were possible some time ago before the compressible gasses update.

Originally posted by Wingnut:

Dont forget to put in a one way valve with the gas relief valve or the tank will suck air in as well.

Adding a gas relief valve is like shooting yourself in the foot. You definitely don't want a one way valve on it either, since this further drops the flowrate and will prevent you from pressurizing the tank, making it impossible to get all the fuel out of it due to a vacuum forming inside.

Best case scenario you got pumps to pressurize and depressurize the air inside the tank, depending on if you want to operate your engine or fill/drain the tank (to refuel or for fuel trading).

The gas relief valve with no pumps has a terrible flowrate and you'll wait forever for medium/large tanks to fill up/drain.

[fmforbes]

Originally posted by Captain:

Originally posted by fmforbes:

I've added a gas relief valve, but the same issues persists. Maybe it is something else or I installed it wrong, but I am all out of ideas.

Heres the updated version with the fuel vent.
https://steamcommunity.com/sharedfiles/filedetails/?id=3207246550

You added a gas relief valve but, did not put a fluid port on the end. So nothing is going to happen. You need a fluid port on the end of the relief valve. https://i.imgur.com/GMT6T2c.png Your valve

Thanks for the picture, i've fixed that fluid port. However, no change on the engines :( I am going to try rebuild an engine controller and see if that fixes it

[fmforbes]

Originally posted by GrumpyOldMan:

Originally posted by Captain:

Just ran a test. 29,015 L. Pumped into the diesel sell on Donnkk. Took 13.31 minutes. Seems Reasonable to me.

So 35l/s? Seems rather abysmal considering 450l/s were possible some time ago before the compressible gasses update.

Originally posted by Wingnut:

Dont forget to put in a one way valve with the gas relief valve or the tank will suck air in as well.

Adding a gas relief valve is like shooting yourself in the foot. You definitely don't want a one way valve on it either, since this further drops the flowrate and will prevent you from pressurizing the tank, making it impossible to get all the fuel out of it due to a vacuum forming inside.

Best case scenario you got pumps to pressurize and depressurize the air inside the tank, depending on if you want to operate your engine or fill/drain the tank (to refuel or for fuel trading).

The gas relief valve with no pumps has a terrible flowrate and you'll wait forever for medium/large tanks to fill up/drain.

I have tried pressurising the tanks... but for some reason my fuel range went from over 100km to 20km. 20km from 40,000L?!?!?! And no change in top speed.

With this game it is so tough to figure out if i'm an idiot or its a bug

[Wingnut]

Originally posted by GrumpyOldMan:

Originally posted by Captain:

Just ran a test. 29,015 L. Pumped into the diesel sell on Donnkk. Took 13.31 minutes. Seems Reasonable to me.

So 35l/s? Seems rather abysmal considering 450l/s were possible some time ago before the compressible gasses update.

Originally posted by Wingnut:

Dont forget to put in a one way valve with the gas relief valve or the tank will suck air in as well.

Adding a gas relief valve is like shooting yourself in the foot. You definitely don't want a one way valve on it either, since this further drops the flowrate and will prevent you from pressurizing the tank, making it impossible to get all the fuel out of it due to a vacuum forming inside.

Best case scenario you got pumps to pressurize and depressurize the air inside the tank, depending on if you want to operate your engine or fill/drain the tank (to refuel or for fuel trading).

The gas relief valve with no pumps has a terrible flowrate and you'll wait forever for medium/large tanks to fill up/drain.

Pressurising a fuel tank is good for emptying it but bad for filling it. To fill it it is best to depressurise it and that means letting any gas trapped inside an outlet using a gas relief valve and a one way valve (or pump) to prevent outside gas from going in. The reduction in flow rates caused by valves sucks (gawd knows why the devs added that feature, they surely shot themselves in the foot with that, lol) but its better than not having a gas relief system and trying to just refill a fuel tank that is pressurised with gas inside by just pumping fuel in.
To fill a tank pump liquid in and suck gas out at the same time.
To drain a tank pump gas in and suck liquid out at the same time.
Both cases using relief valves and one way valves or pumps where necessary to sort and direct flow and to prevent clogging.

[Captain]

Originally posted by fmforbes:

Originally posted by GrumpyOldMan:

So 35l/s? Seems rather abysmal considering 450l/s were possible some time ago before the compressible gasses update.



Adding a gas relief valve is like shooting yourself in the foot. You definitely don't want a one way valve on it either, since this further drops the flowrate and will prevent you from pressurizing the tank, making it impossible to get all the fuel out of it due to a vacuum forming inside.

Best case scenario you got pumps to pressurize and depressurize the air inside the tank, depending on if you want to operate your engine or fill/drain the tank (to refuel or for fuel trading).

The gas relief valve with no pumps has a terrible flowrate and you'll wait forever for medium/large tanks to fill up/drain.

I have tried pressurising the tanks... but for some reason my fuel range went from over 100km to 20km. 20km from 40,000L?!?!?! And no change in top speed.

With this game it is so tough to figure out if i'm an idiot or its a bug

You are just trying to feed the engine. Do not pressurize your tanks. A fuel vent works perfectly fine. The person was talking about trying to do fuel transfer at increased rates using pressure. You only need to prevent a vacuum for your application.

[fmforbes]

I've gone with the nuclear option. I've deleted the large engines and started again with two 3x3 3 cylinder modular engines. The fuel flow is no longer an issue and I can drain the tank fully, so either i had set up my large engines wrong or it was a bug (Im using the same fuel system on the modular engines and they work fine so i think it may have been a bug. However, I have a new problem... my engines keep overheating, so im going to keep working on that.