DIY Fuel pressure test gauge
#1650308 (In Topic #232816)
for proper trouble shooting of the k-jet system, you need a fule pressure test gauge. You can buy full kits on ebay and the like, but many don;t have the right connections, and you may end up playing for more stuff that you really need. Whilst there are plenty of threads that mention building your own, I never actaully found one that listed the parts required. So, I worked it out, built my own, and am sharing my parts list in the hope that it may help others.
- fuel hose 6mm id min 1 metre https://www.ebay.co.uk/itm/183661834646
- 4 x fuel hose clamps (12 to 14mm) https://www.ebay.co.uk/itm/122746108194?var=423163993574
- m10 banjo - barb fitting for 6mm hose. https://www.ebay.co.uk/itm/331603521344?var=540754346778
- mini ball valve 1/4" BSP female-female https://www.ebay.co.uk/itm/232909274363
- hydraulic pressure gauge - 0-100psi, 1/4" BSP bottom entry https://www.ebay.co.uk/itm/Pressure-Gauge-Pneumatic-Hydraulic-15-14500-PSI-1-1000-Bar-40-50-63-100mm-Dial-/283981968082 Make sure you get one rated to 100 psi
- 2 x 1/4" BSP hose tail for 6mm hose https://www.ebay.co.uk/itm/131258049507
- Equal tee - 1/4" BSP 1 male/2 female https://www.ebay.co.uk/itm/111111982104
- Finally, the magic connector that fits on the metering head - 1/4" ID X M12X1.5 STR FEM CONE/O-RING - https://www.ebay.co.uk/itm/322954141185
The above parts will be available from places other than ebay, but I really struggled to find the correct fitting for the metering head anywhere other than ebay. It is possible to use a banjo and banjo bolt in place of the adaptor screwed into the metering head, but plenty of folk have snapped the adaptor trying to remove it so I wanted to correct fitting.
My gauge doesn't use the existing pipe from the WUR to metering head, so I can use a banjo fitting at the WUR end. The banjo fitting I bought (listed above) is quite large, it didn't fit on the WUR next to the other connection. After some careful measuring, I flatted one side of the fitting by about 1mm to allow it to fit. You can probably get lower profile banjo fittings, but I didn't think of that issue when I bought mine!
I'd say that 1 metre of fuel hose is the minimum you can get away with. You'll need some PTFE tape for the threaded joints.
Installed on the car:
Note where I had to flat off the banjo on the WUR end of the pipe.
Hope this proves useful to someone.
Last edit: by paceman
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