First time ever - the Zed started to let me know it wasn't happy. Local trip - engine coughs and misfires like it's gasping for breath.

 

Changes gear a bit erratic due to engine revs see-sawing.

 

Had a brainwave. Stopped. Opened the filler cap and a huge rush of air into the tank. Started up no problems.

 

Now the tank was just under half full - and I always get a small suction on fill up days.

 

Here's the question - is there si=upposed to be a vacuum in the tank at all? Is my filler cap supposed to breath?

 

thanks

 

ps guess is the tank was at such a vacuum inside the pump wasn't able to pull fuel through - an offers?

First time ever - the Zed started to let me know it wasn't happy. Local trip - engine coughs and misfires like it's gasping for breath.

 

Changes gear a bit erratic due to engine revs see-sawing.

 

Had a brainwave. Stopped. Opened the filler cap and a huge rush of air into the tank. Started up no problems.

 

Now the tank was just under half full - and I always get a small suction on fill up days.

 

Here's the question - is there si=upposed to be a vacuum in the tank at all? Is my filler cap supposed to breath?

 

thanks

 

ps guess is the tank was at such a vacuum inside the pump wasn't able to pull fuel through - an offers?

 

petrol tanks always have pressure in them, your problem is related to something else.

petrol tanks always have pressure in them, your problem is related to something else.

OK maybe - but the problem seemed to completely go once cap was released.

 

I'll monitor it for a few days.

 

cheers

are you 100% sure that the air was being sucked in and not forced out ? ...it sounds the same, only way I could tell mine was blowing the air out was by putting a small plastic bag over the cap and opening it then.

 

If it is blowing then it´s probably the carbon canister blocked or breather blocked the excess pressure then causes the fuel pump to fight a battle and eventually die.

are you 100% sure that the air was being sucked in and not forced out ? ...it sounds the same, only way I could tell mine was blowing the air out was by putting a small plastic bag over the cap and opening it then.

 

If it is blowing then it´s probably the carbon canister blocked or breather blocked the excess pressure then causes the fuel pump to fight a battle and eventually die.

 

I wonder? There was a little 'adjustment' that JD did when we put the Profec B on................... having said that it's gone great for nearly 1700 miles since then.