EFI to Carb issues ?!

Mr_13B · Post by **Mr_13B** » Thu May 12, 2011 10:40 pm

Hello from a Newbie

(Andy)

Have myself my first V8. 2 Door Range rover.

Had a 3.5 carb but was nackered so got myself a 3.9 from a discovery EFI.

Everything changed over and SU carbs fitted but she doesnt seem to want to run. She did at the start but wont start at all now...

Few questions. What else did i need to change for the Carb to work on an efi engine ? And when i replace the fuel pump with the facet one i bought do i just replace the old one ?

Cheers in advance !

Andy

paul c · Post by **paul c** » Fri May 13, 2011 12:08 am

should all be good, I have a late 3.9 with carbs in my 110, about to swap another into my other 110.

Ian Anderson · Post by **Ian Anderson** » Fri May 13, 2011 6:30 am

What do the plugs look like

I've heard on a Rover V8 if they get wet (too much fuel / choke etc)then its a "bin them" job and fit new ones

Damn pricy for a bit too much fuel!

Secondly are you getting teh correct fuel pressure at the carbs? too much and it can overcoem needles and seats in floats and flood, too little and nothing to run on!

IAn

ChrisJC · Post by **ChrisJC** » Fri May 13, 2011 7:10 am

You need to ditch the existing fuel pump, and fit whatever pump gives 3-4PSI at the carbs.

Chris.

paul c · Post by **paul c** » Fri May 13, 2011 7:40 am

ChrisJC wrote:You need to ditch the existing fuel pump, and fit whatever pump gives 3-4PSI at the carbs.

Chris.

If it was a 3.5 carb to start with his existing pump should be fine.
The facet can be fitted in the same place, I guess yours is on the side of the chassis, make sure the facet is low pressure though.

Mr_13B · Post by **Mr_13B** » Fri May 13, 2011 9:24 am

Yea it was carb originally... It flew and i mean flew when i fitted it first but now has a problem starting.. I had a problem at the start too when i hit a hill or any sort of incline.. It would just die on me.. The plugs themselves are grand, took them out and there a little used but no carbon build up at all. I'll try and change the pump this weekend, see what happens. If anyone else has any ideas let me know

I'm not looking for tuned monster just want to get it running right and standard ! And a bit better on juice too maybe

ha yea right !

Andy

RoverP6B · Post by **RoverP6B** » Fri May 13, 2011 9:34 am

Hello Andy,

I assume that you have a spill return delivering excess fuel back to the tank?

Your SU carbs are HIF6? What needles are you running?

There is certainly no problem in running carbs on what is essentially an efi engine. I have twin SU carbs on a 4.6 and it runs absolutely brilliant.

Ron.

Mr_13B · Post by **Mr_13B** » Fri May 13, 2011 10:10 am

I noticed on idle that there was overflow of fuel from the carbs and i just ran the line to the ground for the moment till i find the problem. No idea what model carbs and needles they are will have a look tomorrow. I'd love to just bring it to someone problem is there is feck all people in the knowledge in Ireland

But then again if i fix it myself i will know how to fix it in the future ! Will try and read up on carbs the weekend...

Andy

ChrisJC · Post by **ChrisJC** » Fri May 13, 2011 11:01 am

Mr_13B wrote:I noticed on idle that there was overflow of fuel from the carbs and i just ran the line to the ground for the moment till i find the problem. No idea what model carbs and needles they are will have a look tomorrow. I'd love to just bring it to someone problem is there is feck all people in the knowledge in Ireland But then again if i fix it myself i will know how to fix it in the future ! Will try and read up on carbs the weekend...

Andy

Aha, sounds like a problem with the float bowl, or fuel pressure is too high.

There shouldn't be petrol overflowing....

Chris.

Mr_13B · Post by **Mr_13B** » Fri May 13, 2011 11:08 am

Cool... At least i have somewhere to start ! Is there a service kit i can get for the SU carbs to replace all the bits that might have wear and tear ?

Cheers for the help guys !!

Andy

101sean · Post by **101sean** » Fri May 13, 2011 11:31 am

Hi Andy
Not many of us playing with V8s over here

I overhauled my SUs with kits from Burlen, not cheap but comprehensive.
I have a handbook on SUs if you want to borrow it although the relevant pages will come with a Burlen kit.

Mr_13B · Post by **Mr_13B** » Fri May 13, 2011 11:35 am

Goodman Sean. Where did you get the Burlen kit ?

jrv8 · Post by **jrv8** » Fri May 13, 2011 11:38 am

101sean wrote:Hi Andy
Not many of us playing with V8s over here

Hi Sean,
You don't get out much then ?

Jim
www.jrv8.co.uk

Mr_13B · Post by **Mr_13B** » Fri May 13, 2011 12:27 pm

jrv8 wrote:
101sean wrote:Hi Andy
Not many of us playing with V8s over here

Hi Sean,
You don't get out much then ?

Jim
www.jrv8.co.uk

Hi Jim,

Do you do the service kits and can you post them to the south ?

And more importantly do you reckon that's what i need ? !

I'd love to get it up to you to have a look but she can't be drivin on the road the ways she running at the mo

Cheers
Andy

Ian Anderson · Post by **Ian Anderson** » Fri May 13, 2011 12:30 pm

Mr_13B wrote:Yea it was carb originally... It flew and i mean flew when i fitted it first but now has a problem starting.. I had a problem at the start too when i hit a hill or any sort of incline.. It would just die on me.. The plugs themselves are grand, took them out and there a little used but no carbon build up at all. I'll try and change the pump this weekend, see what happens. If anyone else has any ideas let me know I'm not looking for tuned monster just want to get it running right and standard ! And a bit better on juice too maybe ha yea right !

Andy

I think you may have a blockage in your fuel line
Your "it dies when you hit a hill" give me this thought
Normal running the pump and fuel line can just about cope but give it wellie or need more juice to climb and it cannot pump enough fuel.

Facit ret top pump has an inbuilt inlet filter - this could be crudded up

Or your fuel tank could be pealing paint and a "flake" blocks off the tank outlet / fuel pipe pickup.

Also if one of the carps has leaked fuel - again points towards crud that has got into and held a needle and seat open

also check any in line fuel filters you have and make sure they are clean

Ian