In order of cost:
Fuel in the oil
Incorrect oil
BAd oil pressure switch
internal mechanical wear ( this is the most likly but most expensive.)
The low pressure port on a 1990 Ford van is in the rear of the engine compartment. It is on the passenger side, near the firewall.
it has a machanical fuel pump mounted on the engine. so there would be no pressure as you turn the ignition on, but would only get pressure once the engine has turned a few times, by the starter motor, in order to create fuel pressure. but check your fuel lines, usually they would be your problem
The fuel pressure should be 45 psi .
The fuel pressure for a 1990 D 21 pickup is dependent upon the size of the engine. In general, the fuel pressure should be approximately 20 pounds per square inch.
50-60psi key on engine off, 45-60psi key on engine running
if you press the pedal to much that is what can cause the engine to flood
There are several things that can cause your 1990 Honda Civic engine light to come on when you go over 60 miles per hour. The most common cause is a malfunctioning PCV valve.
Connect a fuel pressure gauge to the schrader valve located on the fuel rail that feeds the fuel injectors.
The fuel pressure regulator on a 1990 Geo Prizm is located in the fuel line that runs along the valve cover of the engine. It is an inline device that is no bigger than the fuel line itself.
Front left side of the engine below the cylinder head in the engine block.
Advertised engine oil pressure is: 1000 RPMs----6 LBS or more 2000 RPMs-----18 LBS. are higher
Perhaps thermostat is not opening