Seat Ibiza 1.4 petrol + LPG - gasoline pointer dropping despite driving on gas

Hello,
2 months ago I bought a Seat Ibiza 1.4 2004. with a BRC LPG installation. From the very beginning, despite driving on gas, the petrol tip was dropping. However, I read on various forums (including the electrode) that it is normal and after turning off the engine (computer reset) the tip should indicate the correct amount of gasoline. Whenever the reserve warning light came on, I refueled about half of the tank (according to the directions), but I was surprised that when driving a 200 km route on gas, the gas tip dropped by as much as 1/4. I already thought that it might be an installation that also charges gas despite driving on gas, but the mechanic ruled it out and said that the computer probably counts the kilometers driven as gasoline despite driving on gas. At one of the refueling of gasoline, the distributor bounced, indicating that the tank was full, while the gasoline pointer showed less than half. So I thought it was a bug and I have a full tank. However, today, after turning off the engine, I could not start the car again. Only after pouring a few liters of gasoline did it start normally. I read that the gasoline tip should return to the correct state after restarting the car, but this is not the case for me.

While driving the next kilometers on gas (the gas indicator shows that I am driving on gas - according to the kilometers driven, the amount of gas in the tank is decreasing) suddenly, e.g. when overtaking, the petrol pointer drops. What could this be caused by? I can drive 100 km and the pointer won't budge, and I can drive 20 and it will drop noticeably. And another question, is it possible that if the indicator shows no fuel, and there is fuel in the tank, however, is the electronics giving the signal - no fuel, or is it trying to get fuel from the tank despite the indications of the indicator?

I suggest you take out the float and see what its condition is and whether it is clean there, what the electrical connection of the float looks like.
Instead of a float, you can insert a potentiometer and check if the fault lies with the float in the tank.

After today's situation, I refueled the car to the full, less than 50 liters of gas came in and the tip showed that it was full, so when the distributor bounced back, I just had to air out. Now it will turn out if the pointer shows the real level of gasoline in the tank.

grala1 wrote:

I suggest you take out the float and see what its condition is and whether it is clean there, what the electrical connection of the float looks like.
Instead of a float, you can insert a potentiometer and check if the fault lies with the float in the tank.

Since the tip now shows a full tank, it is probably not the fault of the float?

LuPio92 wrote:

Suddenly, e.g. when overtaking, the petrol pointer drops. What could this be caused by? I can drive 100 km and the pointer won't budge, and I can drive 20 and it will drop noticeably.

The gas installation can be set up so that in the event of excessive engine load, when the gas pressure drops (due to exhaustion or wrong selection of installation components), it can support itself with gasoline. So when you drive slowly you drive on gas and when you step on the engine starts to run on gas without even signaling it. First, make reliable combustion measurements.

The problem is that I was at the gas operator who deals with BRC and he ruled out such a possibility, because it is not that type of installation ... Today I was also overtaking at high revs and the pointer did not move. Magic...

Show what you have under the hood, show where the hose from the LPG gas reducer goes.
The 4th generation of LPG should already be there, which is just such a possibility.
However, it has nothing to do with it, since the pointer moves significantly during the 20 km route.
In my opinion, if the pointer suddenly can move significantly or the pointer turns into an egg - it shows that there is fuel and there is no fuel, the problem may be in the meter, sensor in the tank or in the installation between the meter and the sensor.
Maybe you are explaining something wrong because you wrote that it was not possible to start the car, it started after refilling gasoline, but you did not write anything as long as the indicator was showing.
I have the impression that this gas engine has no idea about this installation and this car.

grala1 wrote:

Show what you have under the hood, show where the hose from the LPG gas reducer goes.
The 4th generation of LPG should already be there, which is just such a possibility.
However, it has nothing to do with it, since the pointer moves significantly during the 20 km route.
In my opinion, if the pointer suddenly can move significantly or the pointer turns into an egg - it shows that there is fuel and there is no fuel, the problem may be in the meter, sensor in the tank or in the installation between the meter and the sensor.
Maybe you are explaining something wrong because you wrote that it was not possible to start the car, it started after refilling gasoline, but you did not write anything as long as the indicator was showing.
I have the impression that this gas engine has no idea about this installation and this car.

Later I will post pictures of what it looks like.

The indicator showed a reserve for a long time, because as I wrote earlier when refueling the gasoline one time, the distributor bounced, so I thought I had a full tank, and the indicator shows badly and I just ran on gasoline, until at some point when I tried to start the car it did not could ignite. Then I thought that maybe the gauge shows the level of gasoline well, so I added a little bit and then it fired immediately, then I went to fill up and there was less than 50 liters of gasoline and now the gauge shows a full tank. I did 130 km on it yesterday and the needle did not move, even though I was overtaking a few times at high revs.

Added after 2 [hours] 18 [minutes]:

And this is what it looks like under the hood:

It all depends on the ECU, there was no problem in the factory, perhaps there is already a correction of the amount of fuel from the mileage and you need a fuel level emulator. Each sequential installation can use gasoline, if the gas engine says it is not possible, it would have to be changed.
It's nice that someone improved the manifold and the injection assembly - you can see the plugs.

This is the equivalent of Fabia.
I have not met yet so that it is like in the French here.
He would mount a potentiometer, set it, ride it and it would be known.

grala1 wrote:

I have not met yet so that it is like in the French here.

It is switched to the calculated level after lighting up the reserve. Do you have any way to force the meter to display the float status even after it lights up?

grala1 wrote:

This is the equivalent of Fabia.

In 04, they put a meter into these ibiz, which went to the factory at the very end of production (precoded pills), similar to the 1.4 on single coils, so slight changes can be made.

Since the problem has always been there, I suggest a test. When the pointer goes down, add 5 liters of PB or put it on a steep hill. When the state comes back it's an emulator.

When driving with a connected laptop, you need to check organoleptically whether it is propped up with petrol or not, brc has such an option in terms of settings.

What do you mean by "calculated level"?
The fact that only restarting the ignition can turn off the reserve?
1.4 on single coils in Fabia was already available before the Ibiza 6L entered the market.

grala1 wrote:

What do you mean by "calculated level"?

Until the reserve is turned on, the indicator shows the amount of fuel based on the measurement, when lit, the petrol display decreases with the kilometers traveled despite driving on gas.

grala1 wrote:

1.4 on single coils in Fabia was already available before the Ibiza 6L entered the market.

This engine entered the factory in 06, previously they mounted its older model on the coil and ignition cables

In 2003 I have 1.4 16v szmelcwagen.

There were 16V with one coil and four.
The ones with one are, in my opinion, the ones with Axx engines, the ones with four are Bxx.
Look here
http://baza.edpol.pl:8080/partscatalogue/cars.aspx?a=00106&b=04777
The program shows me that BBY has been since 2001.

I gassed BBY. With one coil, I know 1.4 from felicja 8v and I also gasped

@ grala1 You're right. I was firmly convinced that all those 1.4 on single coils had> = 80 horses, and it turns out they had the same amount as AUA. According to elsa, they have been assembling BBY since 2002, I was looking for this type of motor for the swap and I did not find it in the fabia below MY07, which further confirmed my misconception

After refueling several times, the pointer does not go down. However, when the needle drops below 1/4 of the tank, it regularly drops even while driving on gas. I think this type is, the topic to be closed.