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Re: fuel power problem
You most likely have the power wire rusted off at the top of the bracket for the fuel sending unit/fuel pump assembly, on the top of the fuel tank. This is a very common problem for that year vehicle; I change that item quite often. You can check for power at the wiring harness going to the fuel tank, there should be 12 VDC in the BLUE wire, when the engine is CRANKING. There will be NO power in this wire with just the key on, because, the air-flow meter air-valve needs to open (when the engine cranks, the cylinder pull this valve open, by vacuum) , and the air-flow meter then turns on the fuel pump. To change the bracket, you either need to drop the tank or remove the bed. Hope this helps, and thanks for choosing FixYa.
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this site will tell you how to test the fuel pump relay, .ehow.com/how_4826334_check-fuel-pump-relay.html Hope this helps! another way to check is to, put finger on relay. have someone recycle the key. if its ok you will feel a click and power is going to the fuel pump. Good-Day!
Only Fords have them. Check for power on the fuel pump wire at the gas tank connector with the engine being cranked over. If power there, and no pump action, the pump has failed. If no power, find and check the fuel pump relay - under the hood in the fuse/relay block. First, see if the power feed to the relay is good. One of the terminals that the relay plugs into will have a "hot at all times" power signal. Use a grounded test light, key off, and probe all the terminals-one should show power-will light up the test light.
Do you have a test light? If not, go buy a cheap $5 test light-one with a lead to clip to a ground, and with a needle type probe. Pull the fuel pump relay out of the terminals it is plugged into-you need to check if the power feed for the pump is still available at the relay. Clip the test light lead to a ground and touch the test probe to the positive battery post-to check that your ground is good- tester should light up. Now touch the probe to all of the terminals that the relay plugs into. One terminal should have power with key off. If no terminals have power, you have lost the power feed for the pump. Double check all your maxi fuses in the power distribution box. Either a maxi fuse or a fusible link will be the power feed for the fuel pump relay. If the power feed is there at the relay, try a new relay. If still no pump, a shop will probably have to check your fuel pump circuit. Did you check for power at the fuel tank while the key was held in crank? When the engine is cranking, the fuel pump wire should have power. When the key is turned to on, the fuel pump should have power for about 2 seconds, to pressurize the fuel system. Then when key is turned to crank or start, the fuel pump should stay on.
The fuel pump relay is powered by a fusible link connected to the starter solenoid on the positive battery terminal. That fusible link feeds the 10 amp fuse near the relay. You can test the fusible links with a 12 volt test lamp. If the fusible link test okay check for an open circuit in the wire between the link and the 10 amp fuse. Hope this gets you fixed.
You can use a voltmeter and test the power to the fuel pump. You can test power to the fuel pump relay as well. You can test the fuel pump relay with an ohmmeter on the RX1 setting to see if it is good. Make sure to check your fuses as well.
Another good test is a fuel pressure test.
When you first turn your car's acc. on without starting the car, you should hear the fuel pump prime itself up for about 5-10 seconds. You should be able to hear it pump.
how did you jump the fuel pump relay, by bypassing the relay or by applying power to contact that closes the relay? If you bypassed the relay completely you need to b ench test the relay you can do this easily by using any 12v dc power source. If you tested the fuel pump relay by applying power to the relay and the pump run and developed pressure. I suspect a wiring or ground issue. Good luck