Not sure if this is even available anymore, but ran across it while searching for X300 fuel pressure testing techniques:

http://www.jagrepair.com/images/TSB/...20Pressure.pdf



If we knew the correct unions, I'm sure there are also off the shelf "tees" available as evidenced by someone who posted in one of the various fuel adapter threads a while ago. We'd just need to find the correct part number for the tee, then fit a hose or schrader valve.

 

Fuel rail thread is M14x1.5

I never found any off the shelf tees. Follow my effort here:

https://www.jaguarforums.com/forum/x...-valve-176872/

Spoiler alert, there were too many pieces, fuel ended up leaking, I ended up breaking the fuel rail when attempting to tighten joints.

I think cutting into the soft hose and adding a barbed tee is probably the best, and oddly enough easiest solution.

 

Members of JCNA (Jaguar Clubs of North America) can borrow the tool here-http://www.jcna.com/tool-loan

 

I think cutting the rubber fuel hose is the way to go

From Jim Butterworth:



Don't see a reason why this wouldn't work well, I have part of my fuel lines replaced with rubber lines(near the fuel filter of course) too as the metal ones cracked, no problems so far.

 

This was the post I was referring to where an owner (Rads) found a single tee that worked:

https://www.jaguarforums.com/forum/x...1/#post1848802


If we can find which sized "tee" worked, that might be a good solution for interim testing.

I'm not terribly interested in permanently mounting a fuel pressure gauge as I would rarely look at it, unless I had a suspect problem, then I'd insert something like this to test.

I know a lot of owners have cut the fuel line and inserted & clamped a barbed "tee" with success, but I've had those leak and even cut the hose from the inside out due to vibration. So long term those non-factory connections within the hose make me nervous as fuel spraying on a hot engine is a bad combination. I'm not knocking anyone else's comfort with that solution, but it isn't what I'd like to do as I prefer to not alter the OEM connections on anything if possible so it's reversible and "modular".


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Thanks George, I skimmed the PDF of available tools but didn't see this part number.

It may have been there, but the PDF is an image versus searchable text, and with the document being several pages long I may have missed it.

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Al will check again. One issue is Jaguar changed numbering systems and at times they posted the old (Heritage) number along with the new (Global) number. We have JD 181 for sure which hooks directly to an X 300 (you have to remove the top cover of the wiring conduit to fit) but there are other adapters (310-058-01,310-132 as well as the gauge Jag 1515. We are in the process of consolidation of all tools and a re-inventory with a better cross ref. As far as the PDF vs images the instructions send you to the catalogs posted above where you may see images--have fun.

 

Regarding your continued search Al for a suitable tee for your fuel rail may I suggest you investigate a M14x1.5 metric extension with 1/8 npt port as shown in the attachment.
This part is made here in Australia by www.aeroflowperformance.com.
They make many fittings/adaptors for fluid transfer in cars & their parts are used extensively in the motor sport field.
Surely you have a similar supplier in the USA. The actual fitting has M14x1.5 male thread one end, a M14x1.5 female at the other to fit into your fuel hose connection & a 1/8 npt port to take a suitable gauge. They also make a npt plug to fit when the gauge is not installed. The installation would be easily reversed.
I might add Al that I do fail to share your concerns for barb & clamp fitting in the hose.
I previously owned a Series 3 XJ6 which was fitted from new with the fuel filter in the rubber fuel hose by this method as were many vehicles from this era. Over 20yrs of ownership there were no problems with this style of fitting.
May I suggest that the latter screwed connections used these days are also prone to problems if not installed correctly.
I might also suggest that having the gauge installed on the engine at all times can prove mighty handy if one suffers engine problems far from home. Whilst our modern engines are very reliant on electronics etc the old requirements of engine function "Spark & Fuel" are the standbys & it easy when needed to just check your fuel pressure gauge & tick that box.

John Herbert
(1996 Jaguar XJR)

 

As it turns out they are also available on eBay with not an overly expensive post!

Also found it in UK too

I assume this will do the job?

https://www.merlinmotorsport.co.uk/p...-1-5-tp-m14x15

 

Thanks, those adapter fittings are exactly what is needed.

I figured out the M14x1.5 as well by searching for specs on the fuel pressure regulator and was looking for something similar last night.

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Also on eBay: item number:401381255668 with free int shipping to US.

These are in UK. I'll be ordering one and a liquid filled gauge, see how this works, probably end of this month though.

 

Thanks for the various ideas, but remember that if you are going to use a fitting, versus cutting the line and inserting a nipple/tee, then you need a fitting with an inverse flare for the male and female M14x1.5 OEM male fuel hose and female fuel rail fittings.

So far all the "oil gauge" adapters I've seen have a flat interface, not flared, on the M14 ends and that will leak. If they don't have a flare, you may be able to use an o-ring or sealing washer for quick static pressure testing, but it wouldn't be reliable long term.

So that being said, I am talking with a local hydraulic shop about making a tee hose for me that will be M14x1.5 male inverted flare for the fuel rail end, and M14x1.5 female inverted flare for the hose end, and the tee takeoff will be 1/8 or 1/4 NPT female for a gauge connection. They are seeing if they can source the hose ends on Monday.

In the meantime, I found some other parts that one could use to build a test tee.

https://www.ebay.com/itm/Honda-Fuel-...J/162337221552

https://www.ebay.com/itm/Fitting-Ada...K/162362536559

I hate linking to eBay ads as they go stale quickly, but I didn't find this part anywhere else, and this vendor has been around for a while. So hopefully it will hang around.



Also, the following is the particular fitting that seems to be the hardest to source, the female INVERTED FLARE M14x1.5 that interfaces with the male end of the X300 fuel line. As noted in the product description:

https://www.3sx.com/fuel-line-adapte...-earls-9894dbh

https://www.ebay.com/itm/Fuel-Line-F...H/273049011955


Here's a brass one for about $10 less:

https://www.extremepsi.com/store/pro...roductid=26301

https://www.ebay.com/itm/Fuel-Line-F...H/122535717336




You can then use something like the male M14x1.5 inverted flare Earl 9919DFHERL for the fuel rail end:

https://www.holley.com/products/plum...rts/9919DFHERL



Then you just need an AN6 tee in between for whatever port you need for your fuel pressure test gauge. Something like the Earl's 100192. You'd need two female AN6 unions too like the Earl's 915106.

http://www.jegs.com/i/Earls/361/100192/10002/-1

http://www.jegs.com/i/Earls/361/915106/10002/-1



.

 

I find this thread very informative and useful. My attempt probably failed (miserably) because I wasn’t sourcing inverted flare parts.

I will add that I am still a big believer in minimizing the joints added, so using all of these adapters just increases the chance that a fuel leak will happen sooner or later.

I’m very interested in what plans you have for that hose. Please keep us posted!

 

I agree with the concern about multiple adapters, but again my intention is to NOT keep this tap in place full time. I am a believer in not modifying OEM or adding additional points of failure if it can be avoided. I too would be nervous about keeping a chain of five fittings in-line on the fuel supply.

OTOH, these automotive/aeronatical fittings used in applications like this are actually very secure as they were designed for these applications, I think it would be fine for short term testing.

Hopefully the hydraulic shop can just build the hose.

.

 

Right, I finally got to this and connected everything up using the standard oil pressure adapter I've mentioned earlier in this thread. All worked fine and confirmed my low fuel pressure and faulty fuel pressure regulator. Few things though.
The fuel line end thread when screwed up fully into the adapter didn't leak but the hole for the gauge was in the wrong place so I couldn't fit it in. I had to use a washer and some ptfe tape so the adapter was screwed in only partially. This way the hole in the adapter was up and I could screw in the gauge.
I've had it running for 15-20 minutes, no leaks but I would not keep it like this at all times, not only because plastics are in the way but it just didn't feel safe. For a quick reading its perfectly fine though.

 

BTW, none of the adapters I bought used on the male, non regulator, end of the fuel rail ended up working. Although I was able to find the inverted flare male adapters, it turns out that the female threaded collar on the fuel rail is unusually long so the flares would not mate inside.

I suspect one eventually could find some adapter or possible make one from cutting up the OEM fuel lines and using the ends, but it doesn't look like any of easily found adapters will work.

So now that we've come full circle, it looks like cutting the fuel line and inserting a fuel gauge is probably the best option. My thoughts would be to have a fuel line from a wrecked car to cut, insert the fuel gauge, and swap in for testing if one is worried about leaks. Or just do a very good job installing the adapter.

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