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weber 500 carb fuel return
Posted: Tue Jul 08, 2014 8:00 pm
by Mongman
hey. getting my land rover project finished and need to fit a return feed from the carb. any idea of how to? is there an overflow pipe? using an electric fuel pump so need some way to take the surplus back.
Posted: Tue Jul 08, 2014 8:09 pm
by JSF55
Doesn't come with a return, ideally you need a regulator to keep it down to about 5 psi
Posted: Tue Jul 08, 2014 8:41 pm
by sidecar
Many electric pumps are low pressure and have an internal bypass, this means that you can simply connect the pump to the carb with no return line at all, this is known as a 'dead'head' system. The pump must have an internal bypass with this setup so that it does not stall when the carb does not require fuel.
Posted: Tue Jul 08, 2014 9:38 pm
by Eliot
When i replaced my SU's with a webber 500, i kept the old return pipe but fitted a restriction (and old jet) into the pipe. The theory was you wouldn't end up with boiling hot petrol in the pipework when the engine was stopped. This was on my 4x4, where you would park up, stall or get stuck in mud - typically with a roasting hot engine.
Re: weber 500 carb fuel return
Posted: Wed Jul 09, 2014 8:34 pm
by mgbv8
Mongman wrote:hey. getting my land rover project finished and need to fit a return feed from the carb. any idea of how to? is there an overflow pipe? using an electric fuel pump so need some way to take the surplus back.
What pressure does the pump dead head at??
Posted: Thu Jul 10, 2014 5:46 am
by DaviesDJ
Hi there - I have run weber/Eddie 500/600 carbs on landies for ages and never used a return, just blocked off at the tank. Put the carb on a phenolic spacer, buy a basic fuel regulator - but the carb will take 8psi - and just run it in direct. Never had a problem with boiling.
Posted: Fri Jul 11, 2014 4:02 pm
by Mongman
so how do I stop over fuelling the carb?
Posted: Fri Jul 11, 2014 5:00 pm
by sidecar
Mongman wrote:so how do I stop over fuelling the carb?
The carb itself should stop it getting 'overfueled', the float valves will shut off. This is provided you are using a suitable pump, not an EFI pump or even a carb pump that delivers too much pressure. The Eddy manual states that you need 6.5 PSI, I suspect that it would still be OK with 8 PSI but not anything higher.
Posted: Sat Jul 12, 2014 10:48 am
by Mongman
Now to find the pressure of my pump!
Posted: Sat Jul 12, 2014 3:02 pm
by Denis247
Mongman wrote:Now to find the pressure of my pump!
Unless it's a fuel injection pump it should be ok
I've run a Facet Red Top for years with no problems. Just try it and see before you go to the bother of measuring pressure.
Posted: Sat Jul 12, 2014 3:32 pm
by stevieturbo
Mongman wrote:so how do I stop over fuelling the carb?
Simple, a fuel pressure regulator.
Posted: Sat Jul 12, 2014 9:43 pm
by Mongman
it's the simple cylinder shape with a pipe in and out either end
FIRE
Posted: Tue Aug 11, 2015 8:59 pm
by dava
fitted a different engine in my landy110 came with eddy and fuel regulator started it over fueled backfired caught fire did this far to many times before i realised faulty regulator now use return hose with mig tip restrictor runs fine
used a full size extinguisher Co2 till empty always have one to hand now when working and driving
