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Fuel regulator
tomgregory2000 - 12/3/09 at 08:31 PM

Evening all
I am having a problem with my DHLA carbs and fuel pump, i am sure the pressure is to high for the carbs at 4.2psi and was wondering if this pressure regulator is any good?

Many thanks
Tommy

flak monkey - 12/3/09 at 08:46 PM

Thats the sort most people use.

Had one on my carbs and it worked well. They often come up on ebay quite cheap.

Cheers,
David

britishtrident - 12/3/09 at 08:58 PM

You should never depend on any pressure regulator that dosen't bleed off excess pressure to return line.

You would be wiser to get a new pump and sell your old one.

flak monkey - 12/3/09 at 09:02 PM

quote:
Originally posted by britishtrident
You should never depend on any pressure regulator that dosen't bleed off excess pressure to return line.

You would be wiser to get a new pump and sell your old one.


You dont need a return line with DCOE/DHLA carbs. I have never seen a set up using one.

The regulators are a very simple diaphragm type. Even the expensive regulators dont bleed off the the return line.

The electrical pumps idle once the float chambers on the carbs are full.

Paul TigerB6 - 12/3/09 at 09:04 PM

As per what David says - exactly my set-up and never had an issue. 2.5psi should be fine with your DHLA's

tomgregory2000 - 12/3/09 at 09:13 PM

thanks guys

britishtrident - 12/3/09 at 09:14 PM

That type of regulator can only wear fail and give excess pressure --- you will never see this type of regulator used by a vehicle manufacturer. OEM regulators work on a bleed off principal which is fail safe.

flak monkey - 12/3/09 at 09:23 PM

quote:
Originally posted by britishtrident
That type of regulator can only wear fail and give excess pressure --- you will never see this type of regulator used by a vehicle manufacturer. OEM regulators work on a bleed off principal which is fail safe.


We arent OEMs building cars for 200,000 mile lives and 15,000mile service intervals though....

Injection reulators work in the same way as that one too. Even ones fitted in OEM applications, only they are fitted on the return side anyway. They are still a diaphragm type pressure regulator.

Schrodinger - 13/3/09 at 10:37 AM

If you have a bleed off type regulator the pump will be working at full chat all of the time, just what the low pressure pumps don't need. Equally the carb type cars that I had in the past never had fuel returns so it isn't an oem type solution to carb based vehicles.