VX HPC Weber Hard Starting - Flooding

[Peter MarieEa]

For the 2 years I've owned my '94 HPC the car has been a bugger to start. The problem is the it floods so easily. Even a warm engine thats been shut down for 5 or 10 minutes may already be flooded when I try to restart with out even touching the throttle and I have to floor and crank to clear.

Could the float level be too high or the fuel pump pressure too high? What is the fuel pump specification?

Any suggestions would be appreciated.

By the way I'm running Roger King's suggested jetting for those that are familar. The car runs fine for the most part otherwise.

 

Quick7

[Foxy Smith]

Peter, I also have an HPC on carbs. My experiences would suggest that fuel pump pressures are fairly critical. I can't say however that I have ever had starting problems, I let the pump fill the fuel bowls, two pumps of the pedal (when cold) and it always starts first time. When hot I start with the throttle half open without pumping.

 

Regarding the fuel pump pressure, when I first had the car it was fitted with a high output pump(Facet) which was completely ovecoming the floats and petrol would seep everywhere and drip from the venturii into the filters. The initial solution to this was to fit a lesser pump (Facet fast road) the problem with this was that after a prolonged burst of acceleration with WOT the bowls ran dry! Recently I have replaced the high output pump with a pressure regulator fitted in line just before the carbs. With the regulator at 3(psi ?) it's spot on.

 

Worth checking your float heights also, the spec depends on what type of floats you have, brass or plastic from memory (don't trust it) it's 15mm for the plastic ones.

 

Hope this is of help

 

 

Alan

[philwaters]

You deffinitely want a regulator, set to ~2 to 3psi. This can help the low throttle pick up as well (does on my Zetec).

Otherwise, have you check for a sticking float?

 

Phil Waters

[Nigel Riches]

Have a search on the web for Carb info, as for the pressure of delivery, I think something like 2.5psi was suitable for the Webers, but there had to be a suitable flow rate also, mentioned above, I run a Facet Silver Top, of 1993 vintage, apparently recent pumps of this kind are far from reliable, I've had good service from this item, using a fuel line pressure regulator set to 2.5 on the dial, (what ever that represents), I've had no fuelling problems, got 40DCOE carbs, check the float heights, and the sealing of the float valves. Nigel.

 

1982. 5 speed, clamshells. B.R.G / Ali. The True Colours.