Thursday, December 8, 2005

Fuel system test rig

Easy to make (and cheap) test rig for fuel systems.  Use it to test valves, fuel line connections, gascolator, carburetor float level, etc.  Consists of:

(Photo 1)  1 1/4 to 3/4 reducer coupling...makes the reservoir for the test fuel.  Wrap a piece of safety wire around it so you can hang it up.  Needs at least 19 inch "head" above the item being leak tested.

3/4 to 3/8 bushing to step down to the hose barb

3/8 pipe to 3/8 hose barb

4 feet or so of 3/8 inside diameter vinyl hose

(Photo 2), two more 3/8 pipe to 3/8 hose barbs

3/8 ball type valve, and

another 2 feet or so of that 3/8 ID hose

and a few hose clamps, total cost about $10

To use your tester hang it at least 19" above your work bench and attach the loose end to the valve or whatever you're testing.  Fill the reservoir with fuel or even with water (I use E85 because of its low density and distinctive fruity smell).  Open the hosevalve and wait...if no leaks appear, wait overnight then give it the smell test (if using water place a piece of paper under your test item and see if its damp in the morning).  Of course if you use fuel to test your fuel system components, you should test outdoors and away from any ignition source!

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