When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have sourced and am in the process of replacing both fuel tanks.
The in boot fuel system setup has been changed by previous owners.
ATM it has fuel feed only from RHS tank supplying RH pump and on to filter.
LHS pump is plumbed to T-piece but not from tank.
Both original and replacement tanks have feed and return lines.
What I presume is the return line enters boot on LHS of spare wheel well and has been plugged.
There is no other return line plumbing, apart from original metal pipes from boot to tanks. (Both plugged)
Did Series One have a return line change over valve, that I am missing?
Could I plumb return line to a T-piece and straight to both tanks without a change over valve?
I have searched but can find very little on Series One fuel system.
Hello Bosco, There is not a change over valve for the the return vent lines into both tanks. You don't even need a change over valve for a single fuel pump feed system. Just use a T-piece in between the two tanks to both feed the single fuel pump. The solenoid valves can be deleted with a piece 5/16 pipe. Go out driving.
Hello Bosco, There is not a change over valve for the the return vent lines into both tanks. You don't even need a change over valve for a single fuel pump feed system. Just use a T-piece in between the two tanks to both feed the single fuel pump. The solenoid valves can be deleted with a piece 5/16 pipe. Go out driving.
The return lines are for fuel injected models, later S2 and S3 cars. Blank them off.
I will find some pics of my in boot plumbing later.
If you have a single pump set up just a T piece is required between tanks as previous comment.
I have heard that if you park your car on a steep angle fuel can freely flow to the lower tank and overflow out the fuel cap.
would advise to get back to original condition. The electronic SU fuel pumps are around $250 each. The original wiring just switches between pumps. The valves in the pumps stop tranfer between tanks. I still have my original tanks after 48 years, new pumps and lines from tanks to pump. That is all. Am sending you a pm.
..... The original wiring just switches between pumps. The valves in the pumps stop tranfer between tanks. .....
+1
My Series 1's just changed the feed from left to right tank with the dash switch although I recall there were some market variations in the arrangement. The Parts Catalogue doesn't help confirm this but perhaps useful to include the relevant pages here.
Our climate was very hard on the Series 1. I had the LH tank and both feed pipes replaced after three years. A corroded and leaking fuel transfer pipe from the tank to the luggage compartment across the rear exhaust is still a vivid memory after all these years
The return lines are for fuel injected models, later S2 and S3 cars. Blank them off.
I will find some pics of my in boot plumbing later.
If you have a single pump set up just a T piece is required between tanks as previous comment.
I have heard that if you park your car on a steep angle fuel can freely flow to the lower tank and overflow out the fuel cap.
Lady Mable has a line that comes into spare wheel well on LHS. It is blocked off. I am presuming that it is a return line. I have yet to test if fuel comes out of it whilst engine is running.
The original tanks have a steel supply tube that feeds fuel pump. There are two fuel pumps. They do switch over with selector switch.
The tanks also have a smaller diameter steel tube, which I am presuming are return line, fitted next to feed tube.
I am fine with blanking of tubes, but am curious as to original set up.
It can't get much clearer than Clarke's (upgraded) setup in post #7 and The Mekon's OE setup in post #8.
Graham
My post re pics was in reply to 01XJR post #6, where he stated that he would post pics later.
Thank you, guys for the pictures.
My set up is the same twin pump set up as pics with an additional line (that has been plugged) coming into boot, lhs of spare wheel well. This is the plumbing that I am interested in sorting, if it's function is required, or leaving plugged if not.
The OE setup was a single steel pipe from the lower inside face of the tank running through a grommet into the luggage compartment. A braided hose connected this to the inlet side of the fuel pump. Left and right sides were mirror images.
The outlet side of each pump went via another braided hose to a tee. The tee was fed by whichever tank was selected on the dash switch. The tee output through a single steel hose leading towards the front of the vehicle.
If you have a second (plugged) line coming in from one of the tanks, a photo could help identify the purpose. A lot of things can get modified over almost fifty years.
Ok. It seems that I should have lead with pictures to begin with.
Being new to Jaguar, I was unaware that not all Series One XJ6 are the same. I presumed that the setup in Lady Mable would be the same as all Series One.
Dual pump setup. Same as others.
Original tanks duel pipe setup. 9.45mm & 7.6mm OD
Not EFI tanks. Original to vehicle if corrosion is anything to go by.
Two pipes from LHS tank into boot.
Two pipes into boot from RHS tank. 9.45mm & 7.6mm OD.
Original bodywork. Two plumbing holes into fuel tank void from muffler recess.
Mystery pipe. LHS front of spare wheel well.
Mystery pipe travels forward, over rear carriage and was joined with flared fitting to something at some stage.
Lady Mable is a bit of a mystery car.
She is Daimler badged. Evidence of former Daimler grill showing on bonnet paint. Now has Jaguar grill. Chrome and black door trims, Daimler horn button, black ski slope, seat pleats, hubcaps,etc.
Boot has Daimler plinth but Jaguar emblem & 4.2 litre.
Could she have been a Double Six originally? Would this explain extra plumbing?
At this point I am happy with plugging tank extra outlets/inlets and running feed system as pictured, thanks to everyones input, but am still curious about additional plumbing.
Love this advice, my recently acquired 71 Series 1 has the same setup with the glass bowl filter. Interesting that mine was also being run on the Right tank with the left being long disconnected. Both were rotten beyond repair and I am reinstalling all new....
Love this advice, my recently acquired 71 Series 1 has the same setup with the glass bowl filter. Interesting that mine was also being run on the Right tank with the left being long disconnected. Both were rotten beyond repair and I am reinstalling all new....
I do hope that you are having as much fun as I am, learning about and breathing new life back into these old Ladies.
I do hope that you are having as much fun as I am, learning about and breathing new life back into these old Ladies.
This is the very reason we're ALL in here doing this, seemingly to uninformed observers, bashing our heads against the brick wall of ancient rust buckets; for the Pure FUN and Enormous sense of accomplishment and Satisfaction in making these Most Beautiful of all machines road worthy again!
And when finished, we have not a Ho-Hum, How Boring cookie cutter car of which Millions clogs the roads and parking areas these days, but a car that Very few have even seen, some 20-somethings not even knowing what it is!
As someone in here said, "If you aren't having fun doing this, you should get a Toyota Camry and be done with it."
(';')
Series One in boot fuel setup.
