Questions and Answers

Camaro Under Pressure Q. Hello my name is Roy. I have a 1989 Camaro with a 305 engine and a 5-speed transmission. I am having a problem with it when I crank it over hot or cold, it takes at least 30 seconds to start. When the oil pressure hit 30 lbs it starts and the computer tells me it is the oil pressure switch.

So I installed a new one and the fuel pump, a new fuel pressure regulator and fuel pump relay switch. It runs fine after it starts. When I look down the throttle body and crank it over no fuel comes out of the injectors at all tell it hits 30 lbs of oil pressure. I put a new fuel filter can you help me out?

Thank you,
Roy

A. When the key is first turned ON, without the engine running, the ECM will turn the fuel pump relay ON for two seconds. This builds up the fuel pressure to normal operating pressure. If the engine is not started within two seconds, the ECM will shut the fuel pump OFF and wait until ignition reference pulses are present. As soon as the engine is cranked, the ECM turns the relay ON, which powers the fuel pump. The ECM continues to power the fuel pump during engine operation. If the fuel pump relay fails, it is backed up by the oil pressure switch, which continues to operate the fuel pump as long as oil pressure remains above 28.0 kPa (4 psi).

A faulty fuel pump relay can result in long cranking times, particularly if the engine is cold. An inoperative fuel pump would cause a no start condition. A fuel pump which does not provide enough pressure can result in poor performance.

Additional Information provided courtesy of ALLDATA