When to play and avoid play e4 followed by f4 as white?

your correct, E4 F4 Nf3 is not a universal opening, it will not work against everything. The London System however is a universal system. 

Yes, i am aware of that.

I would like to know what kind of openings my move order will work against and when it should be avoided. For instance, i know that against e5 it works, and against Sicilian defense  (i think).

I can’t say I recommend the King’s Gambit at your level. 
London System is a solid opening choice, and as @coleblakeman01 wrote, it is a universal opening, for instance if Black plays 1...Nf6 instead of 1...d5, you can play 2...Bf4 in both cases. I’m no London expert, as I don’t even play 1...d4. 

I’ve noticed you mostly play 1. e4 in your games, so you can also experiment with 1. Nf3 and try openings like the KIA. If you want d4 openings, you can play the London, as mentioned before, or the QGD. 

I've played the london almost always for 6 months for reasons mentioned earlier - its a universal opening. But then i started to get tired of it and i realized that playing system openings hinders my learning since i just repeat the same moves every time.

e4 and kings gambit are more aggressive, attacking openings that lets me develop my attacking skills, which are quite poor. And this type of openings can't be played mechanically since i have to observe my opponents ideas early on and adjust to them. That's why i started to experiment with e4, although i am more familiar with d4 opening (including queens gambit).

The short answer to your question is:  no.  You cannot blindly play e4, f4, and Nf3 - and even when you can, you are likely to get into positions that are vastly different than a King's Gambit.  For example:

There, it is playable if you understand how to play the Grand Prix.  In other circumstances, you may end up giving black a very nice position (e.g. against a Modern or Pirc, you might allow c5 where you are unable to play d4 because black has it well covered).

But getting to a more important topic:  you should not try to play universal systems at the 1300-level - and you should not try to force an opening where it isn't being played.  If you start with 1. e4 and your opponent does not challenge the center, you should play d4 on move 2 (the reverse is also true - if you start with 1. d4 and your opponent does not challenge the center, you should claim it with 2. e4).  Learn the opening principles and it will help you play better in positions you have not yet developed a preferred counter to.  If you like the King's Gambit, when your opponent plays 1...e5, you're golden.  If he doesn't, develop your pieces sensibly.

Thanks for your advice, tacticalblindspot. I guess this answers my question.

I do not think you read what I wrote.  2. f4 is the old mainline (and you are correct, it is not currently played because 2...d5 makes white's game very difficult).  The point I made was not "OMG this is how you get into the Grand Prix", but that if you are trying to force a King's Gambit position regardless of what black plays, you are not going to be successful, and that is not how you should approach the opening.

When you play e4 e5 f4 it's not the Kings Gambit anymore its the grandier variation of the Grand Prix attack.  Forgive my spelling as I do not know the correct spelling you'd have to figure that out yourself as I am too lazy to find it on google right now for you.  I wouldn't try and think of e4 f4 as a universal system, because, as it has been said, it's not a universal system.  You can get away with playing e4 f4 against c5 as blacks first move however in my opinion, that is not a very solid way to play.  You can find a lot of good advice on that opening in one of Moret's opening books that Spongy likes to post all the time, however, in my humble opinion, nobody, at my level at least, plays into the traps in that book...  What I am saying is you have to be playing against a Moron basically to fall for that opening the way Moret explains how to play it.  That is just my humble low rated opening, based on a few games I tried playing with it.  I wouldn't play it against the Sicilian.  I would only play f4 if black goes for the Pirc, or if black played e5, and I wanted to practice my Kings Gambit.  The thing about playing the London system is that in general, when playing it, the tendency is to play the opening blindly without thinking until you are developed and then try to play the game of chess.  This is a bad habit to learn.  In general, it is good not to play the opening blindly, but to try and make the most active moves, and look for mistakes your opponent makes, and try to punish them.  You don't learn this skill in general if all you do is play the london system.  That is just my personal low rated opinion.  In my view, you should avoid all system based openings, and learn to play classically by developing a pawn center.  FCO agrees with me, learn to play classically first, before you learn a more modern approach.  Not that the London System is more modern than let's say the Kings Gambit, and neither am I saying the Modern opening is Modern!  What I am saying is there was a point where more people played classical chess and it wasn't till later when they started to play openings that refrained from developing a pawn center but rather plan for a counter-attack later on.  I like how Nimovitch talks about this subject somewhat in his book My System.  

In the end, we all got to do what we got to do.  I wish you luck with your chess!

If your opponent has let you play e4 and d4 in the first 2 moves, then you end up with very good versions of a KP opening.  You have a solid space advantage with easy ways to develop your pieces.  Avoiding that because you are worried about facing a passive black defense is a bit silly.  It is like arguing over who can play more passively in the opening.

I think he just thought black would say "You know, after 1. d4 Nf6 2. e4 ... I don't want that free pawn.  Instead, I'm going to play about 4 bad moves in a row so I can get back to normal Alekhine territory ... white will cooperate, right?!"

if they play a french or caro khan then advance the e pawn to e5 i have been getting good wins with it chess  is about trying out ideas good luck give it a try