Fuel pump for 2.5i conversion

For all your questions, problems and DIY stories
Post Reply
User avatar
Millar
Upcoming E21 fanatic
Posts: 196
Joined: Fri Jun 11, 2010 8:46 pm
Location: Scottish Borders

Fuel pump for 2.5i conversion

Post by Millar »

I'm replacing the 2l carb in my 320/6 with a 2.5i and was wondering what i'll have to do about the fuel pump. I take it i'll have to change to an electric fuel pump. If so any recommendations on what one to get and how to go about doing it?
Cheers
Millar


drjim
E21 VIP
E21 VIP
Posts: 1090
Joined: Fri Nov 03, 2006 11:32 pm
Location: Manchester Uk

Re: Fuel pump for 2.5i conversion

Post by drjim »

I run the slugs efi off an e30 318is in tank pump which fits perfectly although the sender is wonky so the fuel gauge reads wrong. I have another one that I will probably use on the Baur, it's basically the same pump as on a 325i so will flow enough fuel.

Jim
1983 316 Pustergrun - track sluG!
1982 Saphirblau Baur 325i

Cars all gone!
User avatar
e21-Mark
E21 Master
Posts: 5715
Joined: Fri Mar 21, 2008 2:19 pm
My E21(s): 316 m52/2.8 Cat Cams & Jenvey ITB
Facebook page: https://www.facebook.com/JackyardBackoff
Location: Cornwall - UK

Re: Fuel pump for 2.5i conversion

Post by e21-Mark »

Or if someone is breaking a 323 the standard pump will do the job, or obviously an e30 325 one will be OK too, as Jim says.
User avatar
Millar
Upcoming E21 fanatic
Posts: 196
Joined: Fri Jun 11, 2010 8:46 pm
Location: Scottish Borders

Re: Fuel pump for 2.5i conversion

Post by Millar »

cheers lads, sounds like the cheaper option, which i will probably go for. but just out of interest what about uprgraded ones by the likes of walbro or facet?
User avatar
murran
E21 Pro
Posts: 1309
Joined: Fri Nov 09, 2007 9:20 pm
Location: sheffield

Re: Fuel pump for 2.5i conversion

Post by murran »

if going for an e30 one, you need a one from a 4 cylinder e30 as these have the return line on the sender (like all e21s). on 6 cyl e30s the return line goes to a pipe on the actual tank. ie; only the feed is on the sender (which isnt like e21s).
Image
Jeroen wrote:Bmwe21.net, for all your insurance solutions :P
User avatar
Millar
Upcoming E21 fanatic
Posts: 196
Joined: Fri Jun 11, 2010 8:46 pm
Location: Scottish Borders

Re: Fuel pump for 2.5i conversion

Post by Millar »

oh yeah completely forgot about a fuel return, bugger. will maybe just go for a 323 one then to be safe.
User avatar
Millar
Upcoming E21 fanatic
Posts: 196
Joined: Fri Jun 11, 2010 8:46 pm
Location: Scottish Borders

Re: Fuel pump for 2.5i conversion

Post by Millar »

User avatar
nas80
E21 Mad
Posts: 2975
Joined: Sun Jun 14, 2009 12:12 am
Location: West Yorkshire

Re: Fuel pump for 2.5i conversion

Post by nas80 »

that second fuel line is a must.

I ran a 323i fuel pump and filter from an e21. but it doesnt mount in the usual place as there are no brackets unless you own a 323i - which you dont, so you will have to make some.

fit if the bolts holding your tanks on are a bit rusty, then prepare yourself for a fight with that second fuel line! this job took me nearly a whole day to do.
[img]http://s13.photobucket.com/albums/a285/nasbucket/forumsig.jpg[/img]
User avatar
Millar
Upcoming E21 fanatic
Posts: 196
Joined: Fri Jun 11, 2010 8:46 pm
Location: Scottish Borders

Re: Fuel pump for 2.5i conversion

Post by Millar »

that is not what i wanted to hear haha, because they will be rusty. actually i think they might have had the fuel tank out when the welding got done, but thats just a bit hopefull...
Have you got any pics of that build? Like where you mounted it and ran the second fuel line?
User avatar
Jason_323i
E21 Pro
Posts: 756
Joined: Sun Jan 23, 2005 3:43 pm
Facebook page: https://www.facebook.com/#!/e21jason
Location: Dubai UAE

Re: Fuel pump for 2.5i conversion

Post by Jason_323i »

You car should already have a second fuel line and I have a couple of is pumps in the back of garage so you can fir one in the tank

Jason
BMW e21 race car supercharged s14 cage and fabrication by www.chizfab.com
Z3M Coupe
2.8 Z3 Coupe
Caterham Supersport
Clio 172 Cup factory race car(50%)
Ferrari 348 Challenge track car
User avatar
Millar
Upcoming E21 fanatic
Posts: 196
Joined: Fri Jun 11, 2010 8:46 pm
Location: Scottish Borders

Re: Fuel pump for 2.5i conversion

Post by Millar »

sounds good to me. would it just be straight swap then, and connect up the second fuel line? and drop another pump into the tank?
Post Reply