injection fuel pumps for 3.5

Ralphh85 · Post by **Ralphh85** » Tue Aug 12, 2008 11:26 am

im putting in an alloy tank for the 3.5 efi, the gauge is sorted, but i now need a pump.

what presure does the standard in take pump put out? 3 bar?

all the facet pumps on ebay only seem to go up to 8psi which im guessing is only carbs?

Ralph

chodjinn · Post by **chodjinn** » Tue Aug 12, 2008 11:42 am

get yourself a cheap Bosch unit out of a fast ford or something, shoudln't cost more than £50. And yes, facet pumps only do low pressure so for carbs only (or as a lift pump for EFI systems with a swirl pot etc.)

ChrisJC · Post by **ChrisJC** » Tue Aug 12, 2008 12:25 pm

The flapper EFI pressure regulator sets the pressure to 32PSI max, and bleeds the excess back to the tank.

So you need a pump capable of exceeding 32PSI.

Chris.

Ralphh85 · Post by **Ralphh85** » Tue Aug 12, 2008 12:35 pm

guess its gonna be a case of tryign and findign out, the metro one is rated to 3 bar, and people put close to 200 bhp still on std pump.

else i guess will be the rangy pump.

or i just found this...... http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 0222187787

will investigate.

Ralph

chodjinn · Post by **chodjinn** » Tue Aug 12, 2008 12:58 pm

^^^ That's the same pump I run in my MG. Bosch 910, very good value.

Ralphh85 · Post by **Ralphh85** » Tue Aug 12, 2008 12:59 pm

how did you mount it? and where?

Ralph

chodjinn · Post by **chodjinn** » Tue Aug 12, 2008 1:04 pm

Mine is mounted in the boot using two exhaust clamps and some rubber sheet for protection/noise reduction; the clamps are the perfect size. Check my build progress in the Garage section, I've just posted a new photo of the rear end.

Ian Anderson · Post by **Ian Anderson** » Tue Aug 12, 2008 4:29 pm

I use a similar one (not purchased that cheaply though) and used a coil clamp to mount it

Also is a good fit

Ian

ian.stewart · Post by **ian.stewart** » Tue Aug 12, 2008 6:07 pm

I use the same pump on m car and it supports my 285 hp without a problem

Ian Anderson · Post by **Ian Anderson** » Tue Aug 12, 2008 6:43 pm

Ralph

Re Mounting the pump

Get it neat the outlet of the tank as they do not "suck" but will pump under pressure along a similar distance a load better.

ie short pipe from tank to pump and longer pipe from pump to fuel rail.

also keep the fuel pump as low as possible so it is not trying to suck fuel uphill

Ian

Ralphh85 · Post by **Ralphh85** » Tue Aug 12, 2008 8:32 pm

yeah that makes quite alot of sence, think i will go for that once since its cheap an should produce more than enough power i intend on producing in the near future.

cheers for the help people!

Ralph