The V8 Owners Forum -

I have been recommended to fit a second fuel pump.

I was told to fit it in-line with the existing pump and just have a two position switch to power one or tother.

Sounds a good idea to me. I have a red top Facet as my main pump driving through a regulator and the second would be a soilid state Facet slightly smaller but up to running my 3.5.

Would you experts agree on the theory.

Regards

Dave

Why?

It's not normal on production cars so what do you need it for unless you think the first is suspect.

If you run in line though you will slow the flow as the secont non running unit will restrict flow - especially if you are running the one closer to yur engine it is then having to suck through the restriction.

If it is for built in redundancy possibly but I would suggest t piece side by side pumps, 2 non return valves, t piece and then back to your current line.

Yes in aircraft the double up but then they cannot pull onto the hard shoulder and tinker under the bonnet!

But even then why?

Ian

I agree with Ian Dave. Dont fit two in lone with one not running.

If you are worried about the pump failing why not just buy a spare and keep it in the boot.

I could understand fitting a second pump in a bypass line with check valves and a changeover switch if you were on a rally or something.

In 1990 my Rover 3500 P6B running an engine mounted mechanical fuel pump started to suffer frequent fuel vapourisation problems. Everybody bar one that I spoke to advised to do away with the mechanical pump and fit an electric one.

The service manager of the local Land Rover centre who I knew quite well said that I could run an electric pump in series with the mechanical if I wished, indicating that it would not be a problem.

I purchased a red Facet electronic fuel pump, mounted it underneath the car on the boot wall, with it's own fuel filter, fitted a switch inside the glove box with fuse.

In my case it works perfectly! The mechanical pump never has any problem in pulling fuel through the switched off Facet, and should it vapourise, then I just switch the Facet on, problem gone. In the 18 years that have followed, I doubt the Facet has been used for more than 10 minutes in total!

As it turned out, the Fuel companies were fiddling with the fuel, as every P6 owner that I spoke to at the time had the same problem. By the end of that year, the vapourisation issue was gone, and the Facet electronic pump remains as my insurance.

I can also fill the SU float chambers before starting the engine too, excess fuel to requirments being returned to the tank.

Ron.