Vacuum gauges are useful, but they only tell half the story. No vacuum
can indicate all is well or it can indicate the fuel pump failed. The
engine - gas or diesel - could not care less about vacuum, it wants fuel.
If you get this:
https://www.ebay.com/itm/Pressure-Transducer-Gauge-15-psi-2-1-16-52mm-analog-voltage-input-LED-light/252098516378?hash=item3ab23e159a:g:DRYAAOSwLghZsBuZ
and this
https://www.ebay.com/itm/Pressure-transducer-sender-15-psi-12V-10-25V-wide-for-oil-fuel-air-water/262874558318?hash=item3d348b6f6e:g:mv0AAOSwIwJZgn8t:sc:USPSFirstClass!21666!US!-1
You will see your fuel pressure and the gauge lights up red if it goes
below 3 PSI. They are available in various ranges, I use a 5 PSI version
for my A4 that lights up at 1 PSI. The electric sender avoids running
pressurized fuel around the boat, which is good in general and really
good for gasoline.
Joe
Coquina
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