Just a few basic questions

[Xvetteowner]

I tuned up my 1987 WE4 today ( 85k miles) The fuel pressure with the vacuum hose on is 35 PSI at idle is that correct? And the vacuum is a steady 16 pounds also at idle is that about were it should be? Thanks for any input

 

[scottyb]

That sounds good, but you should adjust/evaluate your fuel pressure with the vac line off.

 

[Dabigguy]

Fuel pressure should be 40-43psi with the vacuum line off. The regulator's pressure output is affected by boost and vacuum. It adds or subtracts 1 psi of fuel pressure for each psi of boost or vacuum.

 

[notacarlo]

What is the idle RPM? Vac is measured in inches of mercury or just plain old "inches"

You might be a little lean on fuel. 35" pull the line off and it may go to 40-41".

43-45 line off should read 38 or so when reconnected. (or somewhere around there.)