Vanessa is a 1987 Renault 4 F4 van (fourgonette, ex La Poste) fitted with 1108 cc engine with Zenith 28IF carburettor.
The original carburettor (Spanish built) was showing signs of wear, and last weekend I chanced upon a reconditioned French built 28IF carburettor, which although had minor differences in choke cable attachment and a slightly different body shape, fitted easily.
With the replacement carburettor it starts easily, idles well, and initially runs well out on the road. But after a short time it seems to run out of fuel, as if the float and/or fuel inlet valve is sticking and the fuel bowl is emptying. After a short time, it will start again but will not run for very long if the throttle is opened. To drive it home it will only run smoothly in second gear at low rpm, any application of accelerator will cause it the engine to quit again. It idles happily at any stage.
I took the top off, and the float and inlet valve seem to be fine and not sticking in any way. The mixture is adjusted at 1 ½ turns out, and as the old carburettor was working before I took it off I assume the fuel pump etc are working normally. I would prefer to leave this newer carburettor on if it can be encouraged to behave itself; but if needs be I shall need to put the old, worn carburettor back on.
I can find nothing like this in the forums, but I may have missed any similar problems. Any ideas would be appreciated
The original carburettor (Spanish built) was showing signs of wear, and last weekend I chanced upon a reconditioned French built 28IF carburettor, which although had minor differences in choke cable attachment and a slightly different body shape, fitted easily.
With the replacement carburettor it starts easily, idles well, and initially runs well out on the road. But after a short time it seems to run out of fuel, as if the float and/or fuel inlet valve is sticking and the fuel bowl is emptying. After a short time, it will start again but will not run for very long if the throttle is opened. To drive it home it will only run smoothly in second gear at low rpm, any application of accelerator will cause it the engine to quit again. It idles happily at any stage.
I took the top off, and the float and inlet valve seem to be fine and not sticking in any way. The mixture is adjusted at 1 ½ turns out, and as the old carburettor was working before I took it off I assume the fuel pump etc are working normally. I would prefer to leave this newer carburettor on if it can be encouraged to behave itself; but if needs be I shall need to put the old, worn carburettor back on.
I can find nothing like this in the forums, but I may have missed any similar problems. Any ideas would be appreciated