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MG MGB GT V8 Factory Originals Technical - fuel tank for fuel injection

Does anyone know if it is possible to fit the RV8
fuel tank into the MGB, the dimensions look about
the same.


Looks the same there is one on ebay

Thanks Bob,
I've seen the tank on ebay it has everything needed and if it would fit it would take care of all the issues regarding a swirl pot and fuel return.


May be not,
Where does the RV8 locate its fuel pump? It is not an internal one. The best location for an external fuel pump isright next to and level with the bottom of the tank. You can do this is you are using an SD1 back axle, but can't with the MGB back axle because the handbrake cable takes up so much space.
I'll just paste this from elsewhere I'm tired of typeing versions out, it has worked faultlessly for me for over 40 thousand K's now and i've often had the tank nearly empty , less than 5 litres in it a couple of times. No fuel starvation, not ever.
You don't need a swirl pot in your tank. You use two in-line pumps.
A very late model fuel gauge sender (pt # ADU 3218) , which has a fuel uptake line incorporated into it, which,(via fuel line) connects to a large cheap filter (Kmart $18) , which connects to a feeder roller vane pump, which connects to a high pressure rollervane pump. Via the fuel line, this connects to the fuel rail on the motor and thence back to the old pick up point on the tank via a second fuel line. The large filter acts as a very effective, external, swirlpot/antisurge tank, as well as being a filter.
The feeder pump is a small high volume rollervane pump able to keep up with the larger high pressure Bosh pump but more able to draw petrol, The Bosh high pressure fuel pump can deliver high pressure but draws petrol very poorly. The feeder pump can pull through a filter up to about half a meter above the tank without cavitating and becoming noisy (I've tried this). However I would not place it much higher than the top of the tank (ie the boot) as I expect much higher fuel vapor pressure regulations in the future (translation-noisy pump). Do not be tempted to plumb the return line from the engine back into the high pressure pickup via a Tee piece. Small vapor bubbles form in the warm petrol and make the pump cavitate and become very noisy. The return line must go to the tank, which has its own pressure release set up.
All fuel injection pumps will be destroyed by the tiniest bit of debris. An additional benefit of this approach over the in tank swirl pot is that the pump is better protected from debris; but should it fail, is much more easily got at. I actually carry a spare pump in the boot.
The feeder pump is made by Pierburg in Germany and is called an Auto-suction vane cell pump. Stock no. 12001. It can deliver 0.5 bar when used as a primary pump. It cost $95 Australian (apply exchange rate to get an idea what it might cost locally) The main high pressure pump is a Bosh one pt no 0580464070 and cost $140. You should be able to set this up in a couple of hours with some hose clamps, rubber fuel line and some 'bundy' tubing. Bundy tubing is metal fuel line tubing for your "under the car" fuel lines. Can be got from any hydraulic fittings shop (Yellow pages). Its cheaper than rubber fuel line.


Thanks Peter,
This is the route I will take, that way I can use an original fuel tank.

Many Thanks for your input and advice.

Thats OK, the more MGBV8's around, the merrier!
You do need to turn the float around on the late model sender otherwise it fouls on the old pick up (now return) line in the tank. A 10 second job of unclipping, and reclipping. Some people will put their own fuel line into the old sender unit. Some of the early tanks have baffles which means you can't fit the later sender. Other people want to save the $50 for the new sender or just like to DIY. Obviously you can remove the old sender to a safe distance from the tank to do hot work on it.
I prefer to use off the shelf parts when ever I can. You never know when you need a part in a hurry and don't have time for the whole customised thing. I've never had to use the spare fuel pump by the way (I may be tempting fate here).

"Thats OK, the more MGBV8's around, the merrier!'

Peter, V6 MGB's ALSO :-)
Bill Guzman

OK Bill, V8's, V6's V4's. As long as its got a V in it I'm in favour. The spirit of the orrigional design lives again.

I forgot, also that V12 in Germany. Yikes!

Thanks again Peter,I appreciate your advice, it's a minefield out there, I also agree with you about using off the shelf parts, much easier to rectify if anything goes wrong.

Happy motoring.

A V12 MGB, do they drive the car from the boot and how hot is it going to be, as you say, yikes.

This thread was discussed between 24/04/2007 and 27/04/2007

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