Home » Crank, Oil and Piston » Can The Fuel/oil Pressure Switch Cause The Fuel Pump To Not Come On Can The Fuel/oil Pressure Switch Cause The Fuel Pump To Not Come On Can the fuel/oil pressure switch cause the fuel pump to not come on? Tags:Cause, Come, Fuel, Fuel/oil, pressure, Pump, Switch Related Questions Connecting Rods On A 91 Mercedes 350SD. Is this car really a lemon ? I just bought one with 114k on it. Now I here that the connecting rods are prone to bend causing the cylinder Can I Replace My Lt1 Knock Sensor With An Lt4 Knock Sensor Was determined by the LT4 knock sensor, said I would make a good profit on horsepower Answers for The Question p d what kind of car? year make model newer cars – yes older cars – no Lance Yes. Most newer vehicles have the oil switch control the fuel pump power. Should the vehicle run too low on oil, the pressure will drop, the fuel pump will turn off and the engine will shut down preventing serious damage. B maybe if your motor has low oil pressure cutoff switch, but most cars don’t. forgivealot need more info but if you have a Chevy they use the oil presser switch as a safety in case of role over if there is know oil presser it will shut the fuel pump off musiclicker I own a shop, and have done extensive fuel systems work. Most GM vehicles are wired through the oil pressure sending unit (located by the oil filter, or top back of engine) and is done so as a safety feature. When involved in an accident, the engine stops running. As it stops running, it also looses oil pressure, and since the fuel pump is wired through this switch, no oil pressure equals no fuel pump. When you turn your ignition switch to the on position, you hear the fuel pump come on momentarily for 3-4 seconds. This primes the fuel pump pressure that may have leaked off, but does not run the pump. The system has a momentary relay (latch) that pulls in when energised to supply the pump with power, but once the latch heats up, the circuit opens, and if no oil pressure is there, the engine doesn’t run. One can test this circuit simply by purchasing a spray can of carburetor/choke cleaner, spray 3-4 seconds into intake of engine (with throttle held wide open). Remove spray, and start the engine. If it runs for a few seconds and stalls, repeat the procedure. This test primes the fuel system, checks the fire from the ignition, and isolates the problem to the fuel delivery system. All GM systems has a fuel pump test wire (usually around the brake booster or left fender) that is red. Connect a 12 (+) wire momentarily to this wire, and the pump should run as long as you keep this wire hooked up. Many fuel delivery problems can be resolved due to grounding issues such as; no ground strap from engine to fire wall, or no ground at tank to frame. Even the ground at the battery (-) terminal has a wire that bolts to the body, and/or the frame that can cause all kinds of problems. Finally the fuel pressure regulator can have a vacuum hose that is sucking air around the hose, cracked, fell off, collapsing, or clogged keeping the fuel pressure from building up enough to run the engine. As always; One must have a clean fuel filter, no leaks in the line, and the return line to the tank must be free, and without clogs. Glad to help out, Good Luck!!! Incoming search terms: Does The Oil Pressure Switch Turn On The Fuel Pump And Then The Fuel Pump Relay Is Turned Off,Can A Bads Oil Sender Unit Make Car No To Start,Will Vehicle Run While Having Bad Oil Pressure Sensor,99 Blazer Knock No Oil Pressure No Power Overheating Squeaky Belt,98 C1500 Oil Pres Drops And Engine Sputters,Will A Bad Oil Sending Unit Cause A 2000 Silverao Not To Start,Does The Toyota Yaris Have A Fuel Pump Shut-off Switch (low Oil Pressure),Would A Bad Oil Pressure Sender Cause The Motor To Shut Off,2012 Impala Role Over Fuel Shut Off Switch,Can A Leaky Fuel Line Affect Oil Pressure?