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Garage / Re: 40 DCOE Webers flooding
« Last post by EuropaTC on Today at 09:16:53 AM »Hi Alex,
I have a vague memory of the modern mechanical pumps pushing more than the old glass bowl ones but I can't remember where I saw it at the moment.
When I fitted an electric pump to the Elan I also fitted a regulator even though the pump was supposed to be low pressure for carb engines. That was because Des Hamill quotes 1.5 to 2.5 psi in his book and says both weber & dellorto need high volume but low pressure. Hence I didn't want to chance the supposedly 4psi of the pump overrunning the float valves. It's set at 2psi but whether it is 1, 2 or 3 I honestly have no idea, it's just what it says on the body. You shouldn't need one with a mechanical pump but if you had a regulator kicking about I think I'd drop that in the feed line and see if it makes any difference.
I see you've cleaned everything, confirmed float levels and that they do float. I suppose the next step is to try replacing the needles/seats with a service kit just in case they aren't sealing even if they are free to move.
High pressure fuel delivery would apply to both webers, less likely that both webers have identical needle valve seat problems but it's something to bear in mind because something is allowing the pump to override the normal cut off and cause the flooding
Brian
I have a vague memory of the modern mechanical pumps pushing more than the old glass bowl ones but I can't remember where I saw it at the moment.
When I fitted an electric pump to the Elan I also fitted a regulator even though the pump was supposed to be low pressure for carb engines. That was because Des Hamill quotes 1.5 to 2.5 psi in his book and says both weber & dellorto need high volume but low pressure. Hence I didn't want to chance the supposedly 4psi of the pump overrunning the float valves. It's set at 2psi but whether it is 1, 2 or 3 I honestly have no idea, it's just what it says on the body. You shouldn't need one with a mechanical pump but if you had a regulator kicking about I think I'd drop that in the feed line and see if it makes any difference.
I see you've cleaned everything, confirmed float levels and that they do float. I suppose the next step is to try replacing the needles/seats with a service kit just in case they aren't sealing even if they are free to move.
High pressure fuel delivery would apply to both webers, less likely that both webers have identical needle valve seat problems but it's something to bear in mind because something is allowing the pump to override the normal cut off and cause the flooding
Brian