Question about 1985 Ford F150

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1985 Mustang 302 throtle body EFI. Engine won't start. No power to fuel pump,hot wire fuel pump and it starts.

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Check your fuse and relay for the fuel pump. back track power to ignition switch if problem persists

Posted on Oct 03, 2010

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Is it carved or efi??If efi do this::locate your throttle body,pull the air intake hose loose from the throttle body,spray starting fluid or carb cleaner into the throttle body opening, push the hose back onto the throttle body then try to start the car.If it starts & runs for a few seconds then dies,you've got a No Fuel problem.If it doesn't start at all,you've got a No Spark problem.If its a no fuel issue,turn the key on & listen for the fuel pump priming sound.If you don't hear it,check for a blown fuel pump fuse,defective fuel pump relay,a defective computer power relay or a tripped inertia switch.If they're OK,disconnect the harness at the fuel pump,turn the key on and use a voltmeter to test for battery voltage.If voltage is present,the pump is bad.If voltage isn't present,but its present at the fuel pump relay harness, there's most likely a short/open in the wiring harness between the FP relay & pump.You didn't list your vehicle info,so I'm unsure of which type ignition you've got.
Most no starts on a new engine are caused by a ground wire you forgot to connect,wiring harness not plugged in or a timing issue.

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I have a 95 Camry 4 cyl. I had the Distributor changed last year along with the timing belt, plugs, wires, and fuel filter. Now when I drive it goes about 7 miles and shuts down, after about an hour it...


Lets start at the beginning. The engine computer grounds the pump relay. The relay gets power from the EFI relay when the key switch is on and from the starter fuse when the key switch is in the start position. Do you know if the pump relay is getting power from both sources and a ground from the computer ? Can you run a hot wire to the blue black wire going to the pump and keep it running ?

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1985 mustang 3.8 engine running way too rich


This an '85 Mustang with a 3.8 L v-6? Thought they only had the carbureted 4 cylinder , and a 302 v-8, possibly throttle body injected?

Check air delivery system, check timing, any trouble codes?

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When cranking my 90 mustang it sounds like it is out of gas. i recently replaced fuel pump and fuel filter. it was working great. i parked it for 3 months and know i cant get it to start. i have a 302...


Try to add gas to the throttle body to see if it starts that way. If it does, then it's got a fuel delivery problem, again. If it doesn't start and run then it may have developed a spark delivery problem for the ignition system.

Good luck on this repair.

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No power to fuel pump and the ecmb fuse bows as soon as i put it


Unplug all wires to the distributor, coil, fuel pum and injectors, then see if the fuse blows, if it does, sounds like an ECM failure.

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How can i tell if my ignition is going bad i can crank it over but as soon as i start to drive it shuts it self off


First, make sure all your ignition components test out good; ignition coil, spark plugs, plug wires, power transformer, and even your alternator and battery.

Next, check your fuel system; fuel pump, fuel filter, fuel pressure regulator, and even your fuel injectors. Many times a clogged fuel filter can cause idling and hesitation problems. Also check for any restricted air passages starting from your air filter, all the way to your throttle body and EGR valve.ry checking the tps sensor (throtle positioning sensor). if the tps sensor is not working right when the engine warms up the tps sensor will not allow the fuel pump to pump as much as it needs to keep the engine running. The reason it only happens when the engine warms up is because the throttle is chocked when the engine is cold so it does not take as much gas to run it.

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Turn key forward listen for the fuel pump to pressurize if you don't here anything then your fuel pump needs replaced and it's in the tank.

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1985 Ford F-150


if engine won't crack - dead battery
if engine cranks but won't start - no fuel or spark
fuel reservoir is the fuel tank.
a fuel filter can be inside a housing...

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3 Answers

1985 Ford F-150 Truck (EFI) Fuel Problems


i actually have a 1985 302 efi... there are 2 pumps one one the rail right under drivers door and one in the tank.. there are also two filters... one just behind the pump one the rail.. its actually inside a canister that you open with a oil filter wrench then it has a paper element inside..then there is a inline filter that is actually part of the high pressure line the hose is about 3 feet long and runs from your front pump up to the fuel rail agaist the firewall...this one is really hard to find (Buy) good luck wish i hade a carb

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