Could anyone tell me what the maximum fuel pump pressure would be on an X300 4.0l please. I'm looking to replace a steel fuel line from the filter to the fuel rail and I need to know if copper pipe is suitable. I believe the copper is okay up to around 1000psi. Failing that, where can I get the correct steel pipe?

 

The fuel pressure regulator will trap 43 - 47 PSI in the fuel rail which is the same all the way back to the fuel pump outlet

 

Thank you Parker. I was told that it required high pressure pipe, but I had my doubts. I shall re-pipe in copper.

 

May have been reference to low pressure carbureted engines , 3 PSI ?

 

There seems to be a lot of evidence stacked against using copper for fuel lines....google it and read. Maybe a whole lot of nothing?

 

I thought it was 8mm diameter but on closer inspection it's 3/8" dia. I can't get that size copper anyway, but thank you for the warning. I'm now running out of options. With no solution available I may have to scrap the car - for want of a fuel line!

 

In the states there is one auto parts store chain that has the long straight tubing hanging on a rack

They have bending and fittings tooling kits to barrow for free

My recommendation is to pactice the fitting fabrication on a cut off leftover piece and not the final bent replacement section

Oddly the fuel line items ( at least some ) appear to be non - metric

Someone didn't get the memo

 

The US is fortunate to have a specialist for almost every application. Sadly that's not true for the UK, it's becoming increasingly difficult to source non service parts now. I wish I still worked in an engineering workshop and could make or repair just about anything myself.
It does seem bizarre that Jaguar should use imperial size tube with metric fittings.

 

Maybe a plumbing contractor at their shop would be of help but they deal with copper as a thicker wall but still would get you closer

The material may be available as a mail order

I had a GM made in Canada ( Monte Carlo ) that I assumed would be imperial so I sourced a Saab aircraft at work for a piece of hardware that I thought was imperial to be standardized for the American Airlines customer, but I was wrong.

 

All copper pipe here is metric. The swaged end of the pipe which fits to the filter is non standard and can't be replicated on copper. I am considering removing the damaged area and connecting with braided fuel hose and await the manufacturer's spec on the hose. Replacing the total length is a formidable task in any material.

 

Oil lines on aircraft were repaired by brazing incorporating a wire wrap before and after soldier applied that a plumber could do

Maybe on car if precautions taken so you would have to think through.

You can practice on a aluminum tube from a hobby store to get the picture and skill

There may be some dissimilar metal galvanic corrosion precautions.

 

My background is in mechanical engineering and one of the skillsets learnt as an apprentice was forming hydraulic tube. The problem with the jaguar's fuel line is the complexity of bends in conjunction with the requirement to fit snuggly to the bodywork. The steel tube can't be formed by hand in the same way as a copper /nickel brake line. The original lines would have been formed by a cnc bender, so some form of repair section is my only option . I have no problem silver soldering the repair joint, but a suitable flexible hose would solve a few problems.

 

Fortunately, half the fuel lines under the car are low pressure return lines back to the fuel tank from the fuel pressure regulator up front , one of these lines is built up rubber going back aft from the FPR

For a good diagram of the fuel circuit see page 60

jagrepair.com/images/Training Guides/801S - 2000.pdf

This return line may actually be close to zero PSI ( open fuel tank line end plus fuel tank venting errors) plus the fluidic line resistance

The pressure line at the fuel filter is the fitting on the outboard side of the fuel filter

 

The X308 is the same chassis as the X300 as it was more Fordized so the fuel lines may be sized diferently

Fuel Line repair advise - Jaguar Forums - Jaguar Enthusiasts Forum

 

Will this work?
https://www.bes.co.uk/stainless-stee...-8-x-3m-13097/

Or this one?
https://www.s-v-c.co.uk/products/159...al-copper-tube

 

You might find the stainless-steel crack on forming a flare

Had aluminum crack ( they come in different ductility alloys ) on a in house formed aircraft seat rail , got in trouble for officially logging it as a discrepancy as was not airworthy and did not pass by me or my signature

 

Use Nylon fuel hose.

 

Once upon a time Jaguar classic parts supplied replacement fuel lines, correctly formed to shape. Not easy to ship ( collected from dealer) and even less easy to install. Expensive, but doable and make for a very neat outcome. Ask me how I know all of this……
patching your existing lines might be an option, as the corrosion I encountered on my UK car was highly localised to the zig zag area just before the pipes reach the end of the passenger compartment floor. Compression fittings might be an option, if you can source them.
I don’t know what the fuel pressure in the supply line is, but it will not trouble a copper or cunifer pipe, and the return line is negligible.
Mim nit a big fan of plastic pipe in higher pressure fuel lines, but Jaguar use rubber hose as the lines enter / exit the fuel rail, so it can’t be out of the question.
good luck!

 

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I have used a stainless steel braided fuel hose to patch the bad area and it seems okay for now. I fear the next problem with be from the tank to the filter, which will be a serious money to fix. I'll see if I can get another year out of the old girl.