The V8 Owners Forum -

(Carb lovers look away )

Binning the edelbrock/holley setup on my 3.5 in favour of injection and the car is already running an efficient but DAMNED noisy facet fuel pump. The noise has been driving me nuts. Where can I get an aftermarket pump that will flow what I need for the efi but is silent in operation, or am I just being picky now?

to late i looked . if its a standard 3.5 wouldnt the efi pump be ok for the sd1??, why am i helping youve gone to the dark side. Darth vadar has got alot to answer to rich

Hi
sorry to say this but you will not get a compleetly silent fuel pump, however a bosch type impeller pump is pretty quiet, either one in a can with a fuel line in either end, or possably quieter still one you imerse in the tank, an example of each below off ebay.
http://cgi.ebay.co.uk/AUDI-FERRARI-FORD ... 53de4a427a
or in tank
http://cgi.ebay.co.uk/FSE-Sytec-Fuel-In ... 1c09c782ec
best regards
Mike

Just make sure your exhausts are loud enough so you can't hear the pump

"....Do not underestimate the power of the darkside"

the (lack of) exhaust volume is being addressed - I can't hear it running on tickover because of the 'zorts and the fuel pump.

Aha! I didn't think about using a pump from a kjet type system, awesome.

most efi pumps are pretty quiet anyway.

J1MMY wrote:Where can I get an aftermarket pump that will flow what I need for the efi but is silent in operation, or am I just being picky now?

Hello Jimmy, No! Not picky!

Time to go back to basics and install a pump like this:

http://stores.ebay.co.uk/same-day-dispatch-auto-parts




similar to that originally fitted to the Efi SD1 operating with a 12 volt feed but using a ballast resistor sufficient to drop the pump voltage from 12 volts to approx 9 volts.

It will depend upon how much current the pump draws, but a 1.5 ohm resistor will drop 3 volts at 2 amps. For safety sake try to get one rated for 20 watts.

You can see the wire wound ceramic SD1 resistor thro' the oval hole in this image



Rover fitted this resistor specifically to eliminate fuel pump noise (cavitation) resulting in sufficient flow rate and a pressure maximum of around 50 psi, more than enough to satisfy the maximum fuel rail pressure in the range 26 - 36 psi.

Some owners misguidedly removed the resistor resulting in increased cavitation noise, increased wear and shorter pump life, for zero performance gain, because the fuel pressure regulator just had to work harder to keep the fuel rail pressure in spec.

Interesting:

Rover fitted this resistor specifically to eliminate fuel pump noise (cavitation) resulting in sufficient flow rate and a pressure maximum of around 50 psi, more than enough to satisfy the maximum fuel rail pressure in the range 26 - 36 psi.

Some owners misguidedly removed the resistor resulting in increased cavitation noise, increased wear and shorter pump life, for zero performance gain, because the fuel pressure regulator just had to work harder to keep the fuel rail pressure in spec.[/img]

I get occasional pump noise, like its gargling, I have no resistor. Think i'll try this.

Hell
If I could hear eith the Facit red or Bosch HP unit on the GT40 the engine would be dead!

Both are mounted about 4 inches behind the passenger seat in the engine bay!

Make the exhaust louder and you don't have a noisy fuel pump problem

IAn