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How many of you ever replace the Return Pipe when putting New Tubes on the Rail?
Hi Guys
What I was wondering was, how many of you ever replace the Fuel Return Pipe that runs from the rear of the FPR on 'B' Bank back to the Fuel Tank, when you are putting New Fuel Tubes on the Injector Rail
As it appears to be made from the same sort of Fuel Pipe Tubing, although its a combination of Fuel Pipe Tubing and Steel
When Jaguar put that Combo together, the rubber tubing part is only 'Just' long enough to go on the FPR with a Jubilee Clip on the end (at least that is what it is on my own Car)
If that Pipe should ever degrade like the Pipes on the Fuel Rail do or ever detach itself from FPR then you would be looking at a Fireball, as I did take that pipe off once when the Engine was Cold and Fuel Came out like a Fire Hose!
Very Scary at the prospect of what could happen
Any ideas on replacing it, as its a Combo of Fuel Pipe and Steel Tube with no slack whatsoever, which seems to put the Rubber Tube part under quite a lot of strain
I have never changed this yet but have you?
As this is a Pipe that I visually Check every single time before I go out and I am starting to get Paranoid about it coming off, as I have seen what can happen if it does!
Fuel Return Pipe on the back of the FPR on 'B' Bank
Starting to get 'Paranoid' that it might either come off or degrade
Last edited by orangeblossom; Dec 21, 2018 at 06:50 AM.
This pipe is not under much pressure, OB, and the pipe you show (no. 20 in the diagram) goes to the fuel cooler, and then from that another pipe goes back to the tank. It is quite possible to cut out the cooler and go straight back to the tank, running a new hose from the FPR direct to the steel pipe emerging from the bulkhead. Having said all that, unlike the injector hoses, those steel reinforced supply return hoses seem to be bulletproof.
Part number EAC 7938, someone in the USA makes them still:, and SNG list them at an idiotic price! But as Doug said, you can redo them yourself easily, which is what I did. https://www.motorcarsltd.com/eac7938.html
Hi Greg
If I cut out the Fuel Cooler, would I need any Steel Pipe anywhere or could I go with Fuel Pipe Grade Rubber Tubing all the way?
You can just use top notch flexible all the way to the steel return pipe where it comes through the bulkhead
Originally Posted by orangeblossom
How would I rebuild it? Has it got Splines on it like the Injectors to Fuel Rail?
A clip on the FPR, as now, and careful cutting off the swages which reveals a barb, and then a fuel pipe clip on the barb. OEM has got flex then steel then flex, which you can redo as OEM, or just go straight from the FPR to the cooler with one piece of flex.
Go even easier: flexi hose without a steel pipe from FPR to fuel cooler. Done. Just get some hose brackets (1 will do) to make sure it stays where it is and done.
I bypassed my fuel cooler years ago & never had a problem. I didn't want my AC compressor running just to "activate" that thing. That cooler reminds me of using the smallest 5K window AC to cool a 10 room house.
I did reroute all my fuel lines away from touching any heat & used ss braided lines and aftermarket FPR.
That sounds a good idea but what is the advantage or disadvantage, of bypassing the Fuel Cooler? Is not having a Fuel Cooler likely to create problems
Jaguar deleted the cooler on later model XJSs and saloons, so it is probably not needed at all! Cannot do any harm though, but as and when I need to buy new aircon hoses, I shall delete mine, and run a one piece return hose from the bulkhead valve to the compressor. Basically, the more junk that I remove from the V, and the easier the access you get, the better I like it., and the easier the car is to look after and fault diagnose.
That sounds like a good idea but I think I'll start by running a Top Quality Fuel Pipe from the FPR to the Firewall, although there is a Hydraulic Shop near me, who could help me rebuild what I've got
Redo every rubber hose with modern fuel hose. Mine was so cracked on that return line you could damn near blow air between the cracks, the shop was suprised my car hadn't burst into flames.
Very wise words indeed but why oh why didn't Jaguar make that Fuel return pipe just a little bit longer, so that it is pushing on instead of looking like it might be trying to come off
How many of you ever replace the Return Pipe when putting New Tubes on the Rail?
