XJ40 ( XJ81 ) 1986 - 1994

How to test fuel pressure at the rail?

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Old Feb 26, 2023 | 04:30 PM
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JensenHealey's Avatar
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Default How to test fuel pressure at the rail?

I would like to be able to easily hook up a fuel pressure test gauge at the inlet to the fuel rail. Ideally I would like some way to temporarily attach a T between the high pressure hose going to the fuel rail and the rail itself however the screw on-connector there is one I have never seen anywhere else. Has anyone ever been able to find the type of ball connector used to attach the inlet and outlet connections to the XJ40 fuel rail?

Shown below is the connector I am talking about


 

Last edited by JensenHealey; Feb 26, 2023 at 04:34 PM.
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Old Feb 27, 2023 | 04:50 AM
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in hydraulics, this is a common connector. I would co to a hydrolics shop, and have a piece press-fitted with the right connectors.
 
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Old Feb 28, 2023 | 12:17 PM
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Hi Steve,

The threads are metric. Here's a setup devised by Bryan N at the Jag-Lovers forum:




Cheers,

Don



 
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Old Apr 20, 2023 | 08:32 PM
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Default Finally built my own fuel system pressure tester

I finally managed to make my own version of the fuel system pressure test rig for the XJ40 cars.
See the photo below.

pressure gauge, a piece of fuel injection hose and various fittings


I ended up having to buy a M14 x 1.5 die from an ebay seller
 

Last edited by JensenHealey; Apr 20, 2023 at 08:36 PM.
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Old Apr 20, 2023 | 08:42 PM
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Originally Posted by JensenHealey
I finally managed to make my own version of the fuel system pressure test rig for the XJ40 cars.
See the photo below.

pressure gauge, a piece of fuel injection hose and various fittings

I ended up having to buy a M14 x 1.5 die from an ebay seller
Good job, Steve!

Thanks for posting your success.

Cheers,

Don
 
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