Air bubbles in fuel filter

[hoffman]

Bonjour,
Hello to all 403 lovers!
Finally my car got its MOT and I can drive it.
Unfortunately there are few issues that bothers me.
After some KM driving the engine reach its working temperature and then suddenly the engine stop respond to gas pedal and the car stops.
When I look at the fuel filter, its empty.
If I purge water on the fuel pump to cool it down, its stats working again.
I suspect that the fuel pump overheat and fuel vaporize (become gas). Do you think this is the problem?
Another issue I think is maybe the fuel tank is not breathing meaning a vacuum is created and the pump draws air from some point.
Do you know how the fuel tank breath? Should the fuel filling door (left rear tail light) completely seals the fuel hose?
Merci.

[dany]

Bonjour,
Bonjour à tous les 403 amateurs!
Enfin ma voiture a obtenu son MOT et je peux conduire.
Malheureusement, il y a quelques questions qui me dérange.
Après quelques KM entraîner le moteur atteint sa température de travail et puis soudain le répondre d'arrêt du moteur au gaz pédale et la voiture s'arrête.
Quand je regarde le filtre à carburant, son vide.
Si je purger l'eau sur la pompe à carburant pour le refroidir, ses stats à travailler à nouveau.
Je soupçonne que la pompe à carburant surchauffer et vaporisent de carburant (devenu gaz). Pensez-vous que cela est le problème?
Une autre question que je pense est peut-être le réservoir de carburant ne respire pas sens un vide est créé et la pompe aspire l'air d'un point.
Savez-vous comment le souffle du réservoir de carburant? Si la porte de remplissage de carburant (gauche feu arrière) scelle complètement le tuyau de carburant?
Merci

[dany]

first , drive with door petrol open

if is good ok

if is no good post a picture of fuel hose around the engine

[Jef42]

If the gas pipe is too near the engine it is possible the heather of the engine make the fuel become gas (vapor)

Try to place the rubber pipe far from the engine (motor)

[hoffman]

Bonjour,
Thank you for your answers.
Opening the fuel tank lid did not help. Still have bubbles in the fuel filter.
Also, I touched the fuel pump and the pipes entering and leaving the fuel pump. All was cool. I don't think fuel vaporized.
Any other idea how to check fuel system?
Merci.

[hoffman]

Bonjour,
I would like to mention that the fuel filter in my 403 is connected between the fuel pump and carburateur.
I also put new old stock PBICA 34 carburateur (of 404).
Merci.

[top50]

The filter must be placed before gasoline fuel pump.

Warning : fuel filter arises in the right direction.

There is an arrow on it to indicate the direction of flow of gasoline.

[hoffman]

Bonjour,
Thank you for your indication that the fuel filter must be placed before the fuel pump.
Can you tell why?
Merci!!

[top50]

In this way, the fuel pump is protecting potential dross in gasoline.

Install 2 fuel filters is useless and causes a slight loss.

For your problem: check all hoses (from the tank) to ensure they are in good condition.

There is a small piece of pipe to the tank outlet.

[hoffman]

Bonjour,
I have replaced the rubber hose and problem solved!!
But I noticed high pressure in the hose between pump and carb. Is this normal?
Merci.

[Charles B]

Pressure is normal. But what is hight pressure?
Charles B

[hoffman]

Bonjour,
When I open fuel pump rubber hose on carburetor side some fuel and air were splashing out of the hose with some pressure.
When I open fuel pump rubber hose on fuel tank side, fuel leaked but with no pressure.
Merci.