Mike Wills came up with this cute place to mount a
 fuel pressure gage. Helps when setting the fuel pressure
 or trouble shooting things when it won't start.
 These small gages are available from McMaster Carr.

 Dave, can you send me all correspondence with Mike
 as he was installing the engine. It will help
 me understand why he did certain things in a particular
 way.

Paul Lamar


No Bourdon tube gages for fuel. Put an electric sender in that position
and a switch beside it to switch between the inside electric gage and
one under the cowl. If you just have to use a Bourdon gage you can put
an isolator in front of it and run it on antifreeze.
Bourdon tubes eventually split open and spray fuel all over hell.
Lynn E. Hanover

What is it about fuel pressure that causes them to split?
Say.... as opposed to steam?

Paul Lamar

The pulsations. Gages specifically designed for fuel pressure or other
forms of pulsation have chokes with .010" holes to damp the speed of
pressure changes that can affect the tube. The tube is very thin wall
brass sheet formed into a tube and soldered. Then rolled flat and wound
into a coil.

Even those designed for fuel pressure fail with alarming regularity. My
racer came coasting into the pits one day with the window net down and
the drive holding his hand out trying to get some air into the cabin.

The fuel pressure gage had failed and hosed down the interior and the
driver. We were very lucky. I sent it back to Autometer but never heard
a word back. I bought an isolator to put right beside the carb, and ran
the new gage on antifreeze. Then you can use 1/8" Nylon sender hose
instead of braided stainless.

Lynn E. Hanover


Does this apply to the  glycerin filled industrial versions that damp
pulsations? Mike's is 1 1/2 inch SS glycerin filled.

Autometer has a 15 psi for $22 and a $44 100 psi obviously for fuel
injection.

The $22 15 psi is used for carbs with a solenoid pulsations pump
and the $44 100 psi is used with a centrifugal pump. I suspect the
centrifugal pump is much smoother.

I do not think either Autometer one is glycerin filled.

Where do you get the isolaters?

Paul Lamar

I would think that the liquid filled gages would last longer, but you
might be over the Rockies at night when "longer" runs out.
Isolators are available at:

http://www.jegs.com/i/Mallory/650/29806/10002/-1?parentProductId=752902

Or http://www.autometer.com/cat_accessorieslist.aspx?pid=39

Lynn E. Hanover