20 Most Recent 1989 Ford F 150 - Page 4 Questions & Answers

I used to have an 89 F 150 with the 4.9 inline 6 back in the day. I remember encountering this problem and it turned out to be an ignition relay that was getting hot after a certain amount of time. It took lots of relays being changed out before we finally were able to pinpoint the problem. Being that I've already encountered it I would definitely look at swapping that relay with the fuel pump relay with the right next to each other and see what it does at that time good luck


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your idaho is set to low. There could be some strange on the fuel system or trash within the fuel line when you place in gear

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Can you hear the fuel pump engage when you first turn the key forward? Do not attempt to turn on the truck but just place it in the on position you should be able to hear and feel the fuel pump for approximately 3 seconds. If not you have a fuel pump relay problem if not the pump itself.

The fuel gauge is controlled by the sending unit which is on the fuel pump. The fuel pump happens to be in the tank.


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Please give me a little more detail on the tune up.


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how long has the F 150 been parked? You could have dirty fuel lines dirty fuel filters bad people sitting at the bottom of the tank. These are questions you need to ask yourself or share with the viewers.


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please make sure that your battery is properly charged. If it is then I suggest that you get a good test light and start probing your water is coming in. When did this problem occur?

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Do you have a properly charged battery to start with?

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CHECK YOUR CLUTCH LINKAGE AND ADJUSTMENT. REPLACING MOTOR MOUNTS RESTORES ENGINE TO PROPER POSITION AND MAY CHANGE YOUR ADJUSTMENT. SOUNDS LIKE CLUTCH IS NOT RELEASING ALL THE WAY

You must have a manual transmission. Rebuild it. synchronizers are bad. The reason for grinding. Then you have worn shift forks. Reason for popping out of gear. Also replace any worn bearings or just get the bearing kit and replace them all, with the races.

sounds to me like your selenoid is bad

you have to run on the front pump for a while to see if it acts up then and if not do the same with the rear . if it does the same on both then replace your fuel filter and if still no change , change the pump or pumps. These pumps are well known for going out at the same time

you will need check with a ford dealer
there are a number of recalls and TSB's for the trucks with dual tanks.
and if a recall applies to you its free

It could be losing fuel pressure

fuel pressure bleeding off 2 things can cause this bad check valve in pump or leaking fuel pressure regulator.

Check for vacuum leaks eg. PVC hose power booster and hoses around manifold area.

sending unit could have died, bad wiring is most likely the cause. Check to see if the ground needs to be cleaned, and check the power wire for power.

Spark Plug Gap NGK Spark Plugs Tech Video

sounds like a bent reverse fork. You have a mazda transmission, or the T5?

Check for power at the small wire of the solenoid during cranking position on the ignition switch. Could a bad ignition switch( not lock cylinder ) or a starter safety switch either neutral safety or clutch disengage switch, depending on trans type.