Re: TS3.8L 96 oil pressure/fuel pump switch
Quote:
Originally Posted by Tech II
Remove the oil pressure sender and attach a mechanical gage.....this will tell you if the switch is at fault.....
My first item to do. This sender (I guess you mean 'switch') is close to the oil filter at the back of the engine, isn't it?
Yes it is....they call it a sender when it operates a gage.....they call it a switch when there is no gage, just an idiot light....
Quote:
A fuel gage with wild swings is usually the fuel sender in the tank.....
Which IMO could be influenced by swinging voltages from the oil/fuel pressure switch?
No.....the oil pressure switch, is just a backup to the fuel pump relay....let's say, the relay fails,,,,,now the car won't start right away....so as the car continues to crank, oil pressure builds up in the engine and then the switch closes, then sending power to the fuel pump,,,,,,this is a classic symptom of a failed f/p relay, an extended crank....the fuel level gage is a completely seperate circuit......the level sender in the tank is the usual problem.....however, I just remembered from another post, the pass through body connection can sometimes get corroded and cause the same problem.....