I need to check the fuel pump relay but i ca'nt find it. my manual state's there's an alternate fuse box under the dash,but i do'nt have one. that's where the relay is suppose to be. is there maybe a relay that serve's 2 purposes?i also. i ca'nt find the darn fuel pump. is it behind ,or above something?it's all for a 1987 944s porsche nonturbo
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many thing cause engine stall out while driving faulty mass air flow sensor. stopped up fuel filter,faulty fuel pump check fuel pump fuse and relay.faulty alternator look for lose wires on alternator or ignition coils to module.faulty PCM. best code scan vechicle first before buy new parts but first thing to do replace fuel filter see if problem still occurs.
Here's a technique that works for me. Locate the fuel pump relay, in the fuse and relay panel. Pull the fuel pump relay and look at the bottom of the relay. You will see that the cover can be removed by carefully prying it off using a small flat blade screwdriver or an x-acto knife. Once the cover is removed, reinstall the relay. Have someone start the car while you watch the contacts on the relay. If the contacts close, the relay is OK. If you turn the key to on without starting the car, you car close the relay manually. (You can use your finger to close the relay. Listen carefully, at the fill tube with the gas cap removed. If the fuel pump is getting power you will hear the whine of the motor. If not then check the fuel pump fuse first then the 12 volts at the connector on top of the fuel tank. I've had a problem such as you described, where the car will start but stalls if you try to give it gas. I found that some GM's use a small (2 inch)section of rubber hose to connect the pump to the steel fuel line inside the tank. The hose splits which allows enough fuel to reach the engine, but not enough to run it under any load. The fuel filter should be replaced if it is suspect, but probably isn't your main problem. Hope this helps! Dano
3 THINGS WILL CAUSE CAR TO SHUT OFF ON HIGH WAY.LIKE ALTERNATOR - FUEL PUMP - SPARK IGNITION COIL OR MODULE.FIRST OF ALL IF YOU HAVE DASH LIGHTS AND HEAD LIGHTS.ALTERNATOR OKAY YOU GETTING POWER.LISTEN FOR FUEL PUMP TURN ON IGNITION SWITCH ENGINE OFF LISTEN TO HEAR FUEL PUMP RUNNING IN GAS TANK.IF YOU HEAR NO PUMP RUNNING IN GAS TANK.CHECK FUEL PUMP FUSE AND RELAY.BOTH CHECKED OUT GOOD MORE LIKELY FUEL PUMP AT FAULT.IF FUEL PUMP RUNNING CHECK FOR SPARK AT PLUGS.IF NO SPARK.CHECK IGNITION FUSE.IF FUSE GOOD YOU COULD HAVE PROBLEMS IN THE PCM SINCE IT CONTROLS SPARK IGNITION SYSTEM.
This is a great car but I has a few crazy lil things that are a pain. The sending unit in the gas tank needs to be replaced there is a polarity issue with it. Here's the kicker the fuel pump and fuel gauge sending unit are made as one piece so you must replace both. see http://www.oreillyauto.com/site/c/detail/DPH0/FG0115.oap?year=1999&make=Pontiac&model=Sunfire&vi=1357174&partType=C0401&parentPartType=C0025
Check the charging system.
If the charging system is not charging it will not energize the fuel pump relay after start and the vehicle will stall.
If this is a 4 cylinder engine remove the blue charge relay in the under hood fuse box and see if it will start and run. If it will then mostlikly the alternator may not be charging
while someone is cranking over the engine listen under the rear of the truck at the gas tank for the fuel pump. is it buzzing ? if not try again while cranking with a Rubber Hammer tapping on the center of the gas tank, if it starts you will need a fuel pump.
good luck chris
If it takes more than a couple of hours to blow the fuse its most likely the fuel pump. If it blows instantly you could have a grounded out feed wire (+) wire or a bad relay. Look in the haynes manual to get the location of the relay.
Check the Fuse Relay Box under the Hood on the Drivers side for the Fuel Pump Relay. Replace this Relay and let me know where you are. Please Rate my Response Correctly, I need all the Help that I can get! Thanks!