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MG MGA - Twin Cam fuel pipe routing

Can someone provide a photo of the position of the end of the rigid fuel pipe and connection to the flexi hose to the carburettors in a twin cam please. I want to know how high up the firewall the end of the rigid pipe is and how far off the firewall it is. I am cutting down a 1600 fuel pipe to suit. I had thought that if it finished above the heater shelf it would be easier to use spanners on the pipe and flexi hose. However, I think the twin cam had the connection below the heater shelf.

I am having a lot of fun fitting my Derrington head to my car and mocking up a manifold which doesn't make the rear carb foul the starter switch underneath or the front carb hit the bonnet on top.

Thanks
John
John Francis

Hi John
Don't know if this is what you're after-
This is a pic of how the T/C starter switch mounts (different to a carby car) with the o/p gauge line bolted to it plus you can see both ends of the fuel flexy line that just goes straight up and back down in a horseshoe shape
cheers
willy


William Revit

Hi John

Hopefully these photos of my car as I disassembled it will help you.

cheers
Ian





Ian Prior

Hi Willy and Ian

Thanks. Ideally I'd like one taken from the angle in the first pic. However, I guess that is awkward in the twin cam so maybe a second best would be from the top like second picture. The pipe with the yellow tape is the fuel pipe which I will cut to length and solder the end on when I decide where to put it.

John





John Francis

John
Ian's pic shows it as is but his pipe is bent over ,it should point straight up and on the other side of the starter cable with the fitting about an inch above the horizontal plane of the toeboard/firewall
I don't know how you'll go with your switch mounted in that lower (pushrod engine ) position though, the T/C switch is mounted further up the rail to give more room for the aircleaner
To be honest , if your car isn't a T/C you don't need to have it exact just do it to suit your Xflow installation
willy
William Revit

Hi John,
I agree with Willie that it isn't a twin cam so you don't need to be true to something. I have attached a picture of the fuel line routing for my Derrington head. Without the fuel filter it would be essentially what you are trying to achieve.

Regards,
Mark


Mark Wellard

Hi again John,
This message shows the pipe on my twin cam as another example.
Hope it helps.

Regards,
Mark





Mark Wellard

John, William and Mark

You comments on my original fuel line being bent to th the LHS are probably correct as It appears my car had a pushrod motor at some stage.
The red flexible line in my first photo extended across to the LHS.

I agree with the comments made by William and Mark.

cheers
Ian



Ian Prior

Hi John
I replaced the complete fuel pipe system from tank to carbs a couple of years ago because the "rubber" pipe that the car was fitted with had begun to deteriorate. It had got to the point that I had to repair it in a few places because of leaks.

I used 7mm pipe to make sure my carb got enough fuel and copper-nickel instead of steel to make the pipe relatively corrosion free. (I didn't want to have to ever replace it.)
It is covered with a plastic spiral protective wrap like every other pipe or power cable on my car.

The usual route for the fuel pipe is directly upwards on the bulkhead and it then loops over onto the heater shelf and then across to the carbs.

I have always thought that this looked a bit messy and so I decided to tuck the pipe underneath the lip at the front of the heater shelf where it is well out of harms way.

If you are fitting a Derrington head then you will probably have to be a bit creative with the fuel pipe routing but you don't have to bring it up onto the heater shelf unless you want to.

I would route the piping to best suit the installation and to make it look neat.

Don't forget to send us some pictures of where you do decide to route the piping.

Also, it is easy to kink the pipe when you are bending it, so bend it as gently as you can.

Colyn



Colyn Firth

Mark

Thanks, that's just what I wanted. I know I can finish my pipe where I want to for the Derrington but I usually assume the factory engineers did a good job designing things, but maybe not for accessibility. I am amused that the photos you and Ian have sent are of quite rusty cars! Not what I was expecting.
I'll post some pictures of the mock up of my inlet manifold and installation soon. Grandpa duties today.
John
John Francis

John, you should have seen it before it was restored :-)
I have just taken delivery after it spent 50 years under a tarp, hence the rust.
Cheers,
Mark
Mark Wellard

This thread was discussed between 02/05/2020 and 04/05/2020

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