With key on fuel pump runs erratically. I've troubleshot the circuit back as far as the green/white striped wire coming from the ECU. This wire sporatically loses voltage straight at the ECU. Either, something is telling the ECU to cut the voltage to the pump, or the ECU is bad. I really think the ECU is receiving a bad signal from somewhere else, but I don't have enough system knowledge to know what has the capability to do so.
SOURCE: 1991 camaro RS Fuel pump not working- no power to pump
If the oil pressure switch has two wires on it it may be one that shuts down the pump. I'm not positive but I think it completes a ground circuit, not the hot side though (but may run through a relay.) There should be a pump relay under the hood with a group of other relays. I don't have a wiring diagram for your car but you can get a basic diagram in most inexpensive manuals. They wont usually give you locations but at least you can get an idea of how the system works. There usually is a fuse. If the fuse block is not labeled, use a test light and probe the back of every fuse for power with the key on (takes about ten minutes and faster than trying to find info) change any that are blown. The most likely culprit is a relay, so after testing fuses look for it. (usually on drivers fender or on right side near firewall.) Worst case, trace the power lead all the way through the harness 'till you find where power begins.Testing is important here...I could give you much better info if I was there to do it for you. Most important is to stay "on track" till you find the place where power ends. Don't jump all over the place or you will end up doing an incomplete test.
SOURCE: 1998 Isuzu Hombre 2.2L cranks but won't start.
After trying to start, did you pull plugs & inspect them for wet from fuel, as you said you smelled fuel like it was flooding? Also keep in mind MAP sensor also provides info to VCM which then regulates fuel delivery & timing from info supplied by MAP sensor.
SOURCE: Audi A6 RPM Signal from ECU
dont think you are reading the codes right because PO in front of the code is not a genuine Audi code ,well not according to my information ,try autozone who issue these codes or a snap on code reader booklet
SOURCE: i need a free wiring diagram for a 1998 chevy
Black/white is A,........ Green is B ......and Gray is C
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