Question about 1987 Ford F 150

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Fuel pump relay, fuse??

Put a new ignition switch on steering column. Afterwords hooked up wires and turned ignition on. Everything worked fine, all circuits operating as should. I realize as I try and start it that the battery is too low from having the doors open and the radio on. So I put battery charger on battery , negative on neg, positive on pos. switched to 35 amp. fast charge and went on to fixing other things around yard. Later, come to find out that I had left the ignition on and now have the problem of the fuel pumps not responding and the fuel system not pressurizing when the key is turned. Engine is 4.9 L. 300 6cyl. Maybe a relay or something, don't think it has an inertia switch. Checked fuses under dash with test light and all are good. Maybe a relay?

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Check there should be a fuse box under the hood are some small little black are green boxes under the hood one of them is your fuel pump relay.

Posted on Feb 16, 2009

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1 Answer

It just wont start i turn the key and there is nothing the fuel pump comes on but nothing else and i have tried everything i can think of. the only way to start it is by doing a rolling start.


Check signal wire from starter to either solenoid or start relay. Make sure signal wire is connected to starter properly. One side of the start relay leads to the starter the other to the ignition switch. Check sinal wire is connected. If so test signal wire w/ tester. Ohms setting. Test relay ohms setting. Relays usualy dont go bad. Test ignition switch w/ tester. DC voltage 12 volts or greater. Black terminal to neg or ground. Red terminal to ignition switch side of relay/solenoid. Turn ignition swich to start look for voltage reading. Depending on the vehicle it could be anywhere from 6 to 12 volts. If no voltage reading somthing has failed on the ignition switch side of relay. A relay is simalar to a fuse and will be housed w other fuses under the hood. Also all fuses should be checked. This can be done w the ohms setting on tester without removing the fuse. Look at the top of the fuse there are exposed points that allow the tip of each lead to contact the fuse. Only some fuses are like this. Remember signal wire or fuses this is probably going to be your problem.

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1 Answer

No power electric problem


No, not a relay. The ignition switch is too central to the electrical system. It sends power out to most circuits on the vehicle-those that are designated "hot in accessory, run, start" or some that are only "hot in run or start". Being central, it requires a direct battery source, a "hot at all times" source. Anytime the battery is hooked up, the yellow wire to the ignition switch is a hot wire (actually 2 yellow wires-they splice off before entering the switch or before entering the electrical connector for the switch). The source is Fusible Link M on the starter relay, one of many Fusible Links there, and tied in with the positive battery cable connection. So also, the alternator link is there, so is the headlight switch, the hazard and brake lights Fusible Link, and some others that do supply relays (fuel pump, eec relay, etc.). But Fuse Link M is dedicated to only the ignition switch. If you have no power at the connection to the switch, look at fuse link M. It should have some identifying legend or mark.
Where you saw the sparks, was it at the switch itself or the electrical connector to it? Either way you will have to check. If at the switch, It could be a bad switch, and may have also blew out the fusible link. If at the connector, check if it damaged the connector and is losing contact. Post back with what you find. Good luck.

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How do you hook up the ignition to the new sterring column 91 toyota pickup


Looking at terminal block on the vehicle with the connect tang to top wires are numbered from right to left 1 to 4 then bottom right to ldft 5 to 8Terminals 3 & are accessory on . 2,3&4 are ignition on and turn on 7&8. When you turn to start terminals 1,2,4,7,8connect. Terminal 4 is battery power thru fuseable link. Terminal 2 goes to Ignition gauge fuse and turn fuse. Terminal 1 goes to daytime rinning light relay. Terminal 3 goes to acc fuse or radio. Terminal 8 goes to another fuseable link to batt. terminal goes to starter motor. Hope that helps

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I have a 1985 ford f150, did run great but now it isn't getting fuel unless i


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Nov 02, 2012 | 1985 Ford F150

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I have a 06 f150 5.4L the fuel sending unit went out so i had to change to pump and everything, the pickup ran fine before but wen i put the new pump in it will not work so i tried resetting the fuel pump...


Hello, There is a fuel pump Relay in the Powerbox under the hood. The system works this way. When you turn on the Ignition switch, it trips the Fuel pump Relay. The power is routed to the fuse from the Relay and then to the Inertia (safety) cutoff switch. Finally the power reaches the Fuel pump.

You need to test the fuse holder for power before it flows through the fuse. You should have the Ignition on, in order for the Fuel pump Relay to provide power to the fuse. Although the fuse may be good, it can not work without power.

On most Models, the horn Relay is the same part as the Relay on the Fuel pump. Just check your part numbers and swap out the two parts and see if it helps.

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1 Answer

Fuse and relay for the fuel pump


The fuel-pump relay unit is responsible for turning the fuel pump on when it detects the engine is running. When the ignition signal stops, the fuel-pump relay switches the pump off. Problems with the ignition and starting the vehicle often can be traced to the condition of the fuel-pump relay.

Description

  • The fuel-pump relay is a small unit, typically enclosed in a plastic case. The unit contains several sprockets on one side that are clipped onto the ignition system. The fuel-pump relay is engaged only during the start cycle. If it is faulty, it can take longer to start your vehicle.
  • Location
  • Most fuel-pump relay units are located under the dashboard near the steering column. In some cases, the unit is located in the area where the steering column is mounted or near the engine's firewall. The end of the fuel pump relay is typically located near the center of the floorboard, under the carpet in the front section of the passenger's or driver's side footwell.
  • Considerations
  • In addition to difficulty in starting the vehicle, symptoms of a poorly functioning fuel-pump relay include the following: the car dies then starts a few minutes later; the fuel pump makes a strange noise (humming or clicking loudly) for longer than five to 10 seconds after starting; or the engine won't start after you have engaged the fuel-pump switch.
  • Troubleshooting
  • When your car does not start properly, you can conduct a fuel-injection relay test. Two relays are located inside the fuel-injection system; one of them is responsible for turning the ignition on without turning over the engine, and the other is responsible for turning on when the engine turns.



    You can check to see if the first relay is working by touching it while turning the ignition on and off. You should feel a "click" every time you switch the ignition. If the fuel-pump relay is not working, you can "jump" the unit with a small lead jumper cable. You will need to access the fuse panel and insert the cable into the relay unit; the unit will run as long as the wire is inside the relay and can help start your car.
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