Engine Specific Info and Questions > VW Gasoline Engines
A question about the dark side
srgtlord:
Not diesel related but still vdub related. So Ive been playing around with my carb powered vw cabriolet for a good few years now , but I never have been happy with the fuel system I was running. So Im installing an electric fuel pump coupled with a bypass style regulator. Now if I install a 1.5-4psi pump, but the regulator range is 4.5-9psi, will this work??? Will the regulator just not open at all? Would I be better off not using the regulator?
ORCoaster:
srgtlord, I can't see the value of having the regulator at all. It won't do anything as the pump pressure is below the regulators ability to restrict it. Max pump psi is 4.0 and Min regulator is 4.5
It won't build pressure and if you do in fact need something like 6.0 on the carb you will need a beefier pump and then regulate it with the appropriate number of turns on what you have as a regulator now.
Gas-----??? Bah Humbug
TimpanogosSlim:
I'm not familiar with mechanical fuel pumps on mk1 VW gassers but the one on my '77 fiat works just fine.
The bowl in the weber fills when the valve is open and when it's full the floats close the needle valve and the unneeded fuel goes back to the tank through the overflow valve.
No fuss, no muss, no worries.
Some of them have electric fuel pumps mounted in the trunk but the electrics don't work any better and have a higher failure rate. *shrug*
srgtlord:
I think my 3 biggest issues with the mechanical pump I have been running is #1 it came without the required plastic spacer and I ran it that way #2 there is no return port on the stock rabbit mechanical pump #3 any attempt to go faster than 70mph was futile as it felt like the fuel delivery was not good enough(this may be due to issues sucking the fuel through the inactive electric in-tank feed pump or vapor lock)
srgtlord:
I purchased a Holley brand 5-7 psi electric pump over the weekend. I figured keeping the the fuel delivery system within the same brand as the Carb would probably help. I will let you know how it works out
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