Outer Limits 4x4 Board

I have just done this with my '76 3.5.

Anyone need any tips or advice give me a hoy.

Cost me just over $1600 all up.

Dave

did you use the complete rover efi with matching tank? or aftermarket ecu and efi pump / surge tank?

Original tank, after market pump, with pre filter and high pressure post filter. 8mm fuel pipes with efi flexi's.
original ecu/loom from Rover SD1

ooh sounds like a tech rite up coming on! Do it man would be interested to read it!

Billybus, can you please provide some more info the tank /pump lines as i am in the middle of fitting twin sill tanks and twin lpg in the rear and have an 86 RR efi setup to fit but wasnt sure of the tank/ pump situation.

For me it was dead simple....I just replaced all the fuel lines with high pressure ones (with increased bore) the tank was untouched, apart from the return line bit which had a restrictor in it ( I drilled it out).
Then a high pressure pump and filter was installed in the "flow" line.
The bottom line is you need to make a loop...high pressure feed to the manifold, then the return line has to be able to return all the high pressure fuel you didn't use!

Are you intending to use the tanks simultaniously or have them switchable?

I actually used 8mm copper gas pipe for the majority of the fuel lines. Just be sure to lag it anywhere near exhaust pipes.

Dave

Doh!.....I ment using the petrol tanks simultaniously.....not the gas and petrol!

Tanks will be switchable, i fitted the tanks yesterday as i,m getting the lpg setup ready to go. Was going to keep the twin carbs but i have an 86 efi manifold/ injectors etc and which way i go determines which gas gear i use. I will be using a megasquirt ecu instead of the lucas system, i have a commodore efi pump and a 2 way solenoid to control which tank i use so the filter and pump will be after that. The tanks have return lines which i will need to fit a t piece to so return will go to both tanks.

I just remembered... when you look at the efi valley/manifold gasket you will see the top of each inlet port is curved.(Carby ports are square)
EFI heads have this part of each port machined away so the injector spray pattern has a clear path.
You have to do the same.
I marked the ports using the gasket as a template then I stuffed the ports with rags, covered everything then had the wife holding the vacuum cleaner while I used a die grinder to shape the ports.

You also need to make sure that even when on lpg the fuel pump continues to run....stops o rings driying up etc

I put a relay in the line from the coil-ve to the computer loom, so when on lpg the line is open circuit (pump running but no injectors firing)


It's worth it in the end

Mine now runs on gas or petrol at the flick of a switch.


Dave

Hey loanrangie, I think you may have to have your return line switchable as well, so that if you use tank 1 then you return to tank 1...... with a T on the return you will probably over fill tank 2 and give youself loads of problems.


could be wrong but I think it makes sense?

Dave

had the wife holding the vacuum cleaner while I used a die grinder

And I suppose she can check oil and everything, I'm jealous!!

Just to be a pain in the ass by dragging an old topic:

About to go the same setup as you, loanrangie (ie. convert to EFI, twin sill tanks and underfloor gas), just wondering how you ended up setting up your return lines? Was a straight T-piece alright, or did you have to do some fancy setup to prevent one tank overfilling? I imagine if you can run a balance line level with the top of the tanks it would work out ok, but what did you find?

RangingRover wrote:Just to be a pain in the ass by dragging an old topic:

About to go the same setup as you, loanrangie (ie. convert to EFI, twin sill tanks and underfloor gas), just wondering how you ended up setting up your return lines? Was a straight T-piece alright, or did you have to do some fancy setup to prevent one tank overfilling? I imagine if you can run a balance line level with the top of the tanks it would work out ok, but what did you find?

I found that it was easier and cheaper to buy a tdi disco

although i will contemplate efi'ing a 4.4 that will be going into a rangie ute but using single petrol/lpg tanks.

Hey Billybus. So did you keep the 3.5 and but an efi manifold on it?

If so did you use a 3.5 manifold or something different?

And what computer did you use?

I am about to do something similar, but I have a 4.6l on carby at the moment. I have a 3.5 efi manifold but have bought a 3.9l fuel rail as I was told they are better/bigger, can anyone confirm this?
I have also been told to use the injectors from the Jag (4.2l I think) and a Haltech computer.