Best Answer

In most injected vehicles, the computer determines whether the engine is actually running or being cranked before engagning the fuel pump. Once the fuel is up to pressure many pumps are turned off. You'll need to find an electrical diagram of the vehicle, find the wire that powers the fuel pump and make certain that power isn't comming on briefly when you first turn on the key switch. The diagram will also help you identify the relay that runs the fuel pump and any other relevant information. Good luck. hers a hint that could help ya out..the inertia switch in trunk on left side behind covering is a relay.might need reseting or check to c if its getting power on both should ..also just behind front passenger headlight you'll see a large blackish module the fuel pump relay is integrated in that..there should be a data link connecter on firewall of passenger side you will see 6 point holes 2 on top 4 on bottom..looking at it with the 2holes on top your gonna want to ground the left one.with a jumper wire if the fuel pump starts to operate with it only being grounded by link connector your most likely defective component is the pcm..power control module..main computer of car.....dont forget to check fuel pump fuse and all main fuses in engine compartment.....when grounding the data link connecter all it does is bypass the pcm itself.and checks the whole fuel pump circuit..relays if it does work by doing that and only when doing that the pcm is defective.good luck

User Avatar

Wiki User

โˆ™ 2005-12-06 07:47:21
This answer is:
User Avatar
Study guides
See all Study Guides
Create a Study Guide

Add your answer:

Earn +20 pts
Q: What all can you check when there is no power to the fuel pump when switch is turned on?
Write your answer...
Related questions

Should there be power to a fuel pump plug when unpluged from pump and ignition switch turned on?

yes, there should be power if key is on

Bronco ii no power to fuel pump?

Check the electrical plug at the fuel pump for melt-down damage. Check the inertia fuel pump shut down switch. Check the fuse. Check the relay.

Why is there no power to your fuel pump fuse 1984 Chevy Celebrity?

I would expect that the power for the fuel pump would be supplied through the ignition switch so I would start there, that is check the ignition switch.

Why would a 1996 Ford Contour not be getting power to the fuel pump?

Check all fuses and fuel pump relay. Check the fuel pump inertia cutoff switch in the trunk.

Why is your 1990 S10 blazer fuel pump not pumping?

Check there is power to the fuel pump via the connector at the tank. Check fuel pump relay and fuses related to this. Or if there is a fuel cutout switch on this somehwere. If not, then need a fuel pump.

Is the fuel pump switch and reset button the same?

Yes this is a safety feature found on some cars that is an inertia switch. Power is cut to the fuel pump whenever the car is in an accident. You push the switch to reset it and restore power to the pump. There is also a fuel pump relay, that is sometimes called a switch, although it is not actually a switch. This relay closes and turns the fuel pump on when the ignition is turned on. It will stop the pump if the engine is not started.

Where is inertia switch on 1988 Chevy C3500?

Chevy trucks did not have a inertia switch. You need to check the fuel pump fuse and relay and then make sure you have power back to the fuel pump that's in the fuel tank.

What if a mustang won't start changed the fuel pump?

not realy you need to check if is fuel related and if it is check inrtia switch first to make sure you getting power to fuel pump and injector pulse

Where is the fuel pump shut-off switch at?

Most users of the fuel pump shut-off switch is near the starter button in a location where a thief would not find it. You can hear when the fuel pump switch is turned on and of course when turned off there would be no noise.

What if there is no fuel going to the engine on 1994 mercury villager?

check fuel cut off switch make sure its not triggered. check fuel pressure if none see if u hear fuel pump going on if not check for blowen fuse,check for power at fuel pump if u have power at fuel pump replace fuel pump. also make sure ur fuel filter is not plugged it sounds like a fuel pump to me. you will have to drop the fuel tank to replace pump.

What to check for if1986 f150 with duel gas tanks has no power to fuel pumps?

broken wire or bad switch

Will a fuel pump relay stop fuel pump from working?

If the fuel pump relay switch is bad then the fuel pump will not be turned on. Think of the relay like a light switch. If the switch has a bad connection then the light doesnt work.

Were is the fuel pump inertia switch for a 2001 chervolet Malibu?

There is none. Ford uses the inertia switch on many of their vehicles. If you are not getting fuel pressure the most likely cause is a faulty fuel pump. First scan for trouble codes, if there are no codes. Spray starting fluid momentarilary in the air intake to see if the vehicle will start with fuel present. If it runs a few seconds on starting fluid, check for fuel pressure when the key is first turned on and listen for the relay and the fuel pump itself. If no sound from fuel pump check to see if it is getting power before replacement.

Is there a special fuel switch for an 87 Pontiac Bonneville that after overheating will not start?

No switch. Check the relay for the fuel pump.

Where is Reset fuel switch 95 f450 ford power stroke?

there is no reset fuel switch on a diesel

Your 1990 Ford Ranger seems to have power to the fuel injectors and fuel pump when the ignition is turned off This runs the battery down The truck starts ok when the battery is charged and runs ok?

have starter motor checked. ford starters will run a battery down when swithed off if they are worn out.also check ignition switch Check the fuel pump relay. It may be sticking.

What other problems could exist after changing the fuel pump but still no fuel to the fuel filter?

One: Make sure that the fuel pump has electrical power. Two: Check if fuel is flowing in, through, and out pump. Three: Check fuel line to filter for blockage. Four: Fill fuel tank with gasoline. Electrical power is a crucial and easy one. Open up your main relay box inside the car next to the steering wheel and test the switch that feeds power to the fuel pump. make sure there is current running through there. If not, then replace the switch.

Why is there no power to fuel pump fuse 1984 Chevy Celebrity changed the relay already?

I would expect that the power for the fuel pump would be supplied through the ignition switch so I would start there, that is check the ignition switch. Also check the associated wiring for cuts or possibly a loose plug connection.

1989 Chevy caprice I've changed the starterand fuel pump still wont crank?

run a jumper lead to starter crank connection pos feed if it crancks over check for power from ign switch in crank position on solonoid wire if no power check starter inhibitor switch for correct adjustment if ok check ign switch

What if there is no power to the fuel pump of a 99 Chevy Suburban?

Hello there. First how did you determine that there is no power to the pump? I this is true first check the fuse there is a fuse in the fuse box just for the pump. That would be great if that were the case and is usually what the problem is. If you check the fuse and it is good the next thing to do would be to check for power at the fuse with the key turned on. the power to the fuel pump is on only when the key is turned on this completes the circut. Asside from theas two things you will need to follow the harness from the fuse box to the fuel pump to check for breaks. Hope this helps. Blown fuse, bad fuel pump relay, disconnected or broken wiring, and in rare instances, a defective computer.

You have 1993 Infinity Q45 No power getting to Fuel pump in tank?

Check the fuel shut off switch in the truck.Passanger side.You will have to remove the felt cover...It is green in color.You will have to run a volt test to check if it is good.

1990 Buick lesabre fuel problemschanged the fuel pump relay switch and fuse and still have no power to pump?

you might want to check and make sure the tank is ground

95 Mazda millenia have fire no fuel to engine?

check fuel pump for power and pressure. if you turn the key to on positionand listen for pump to make noise as soon as key is turned

The car won't start after replacing the fuel pump on a 2002 sonata.?

try replacing fuel pump relay and check fuce if that dont solve problem check connectors in fuel wiring possybly they sold you a defective fuel pump pull fuel pump connector of check with a test light see if you got power going to fuel pump with ignition switch on

Why is there no power to the fuel pump on a 1988 Ford Escort Pony?

Check the reset switch probably located on the drivers side rear in the trunk area. The switch may be corroded or shot.