[Smooth running then lumpy and cuts out]

The hose and pipe from the tank seem ok just from an external inspection. 

[Smooth running then lumpy and cuts out]

On 9/2/2018 at 9:50 AM, dougbgt6 said:

Is the air bubble in a fuel filter? Do you mean the filter appears only partially full? If so that's not a problem, they all do that.  But more air when you pump could be an indicator that there's a blockage further back in the fuel line or tank. Or the tank is not venting and you're getting a vacuum build up. When it dies while you're on a run jump out and open the fuel filler cap, is there a woosh of air into the tank?

Doug

Where does the fuel tank vent from? All I can see is the fuel line coming out?

[Smooth running then lumpy and cuts out]

7 hours ago, AidanT said:

Can you confirm which plugs you were and now are using? 

Aidan 

Plugs are NGK. Not sure what the previous ones were. 

There is a spark. Problem is definitely on the fuel side I think? 

[Smooth running then lumpy and cuts out]

Been having this problem with our Mk 2 Vitesse. It starts fine and ticks over nicely but when driven it starts to get lumpy on acceleration and then shortly after it dies completely. New carbs have been fitted along with points, plugs, leads, distributor cap, rotor arm and condenser.

I have noticed an air bubble in the fuel line just before the fuel pump and wonder if this is the likely cause? When I manually pump it the bubble stretches but does not enter the pump so stays in place. 

Any advice gratefully received. 

[Stuck float chamber]

Thanks. Do I need to remove the brass nut on the underside? When I try to the float chamber moves with it but it will only turn a couple of mm. 

[Stuck float chamber]

I am in the process of overhauling a pair of Zenith Strombergs from a 1971 (mk2) Triumph Vitesse. I have removed the 6 screws that hild the float chamber in place but it is stuck solid. It’s not the gasket holding it in place. Any tips on how to remove it?

[Lumpy running, cuts out then won’t start.]

Indeed. One if the reasons I’ve been reluctant to change them. 

[Lumpy running, cuts out then won’t start.]

Thanks for the advice. I’ll bite the bullet and take the carbs off. Thanks for the tips. I might replace the fuel lines too while I’m at it. 

[Lumpy running, cuts out then won’t start.]

I have checked that fuel is flowing to both carbs when pumped. The second carb is definitely dry though. Can the float chamber/jets be accessed without taking the carbs off the car?

[Lumpy running, cuts out then won’t start.]

Our Mk2 Vitesse is driving us mad. Following starting and running problems (backfiring and very lumpy) we had a mechanic look at it. We picked it up and it was running smoothly for about 5 miles until it suddenly became lumpy, lost power and wouldn’t start. New distributor, points, plugs and sparking ok. Fuel pump working and fuel getting to the carbs (although may be not evenly)? Please help!!!