Question about 1998 GMC Sierra

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When you turn the key on the fuel pump and daytime running light do not always get power

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Check your fuel pressure relays. You might have a short in the juction box

Posted on Sep 05, 2009

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Why does the fuel pump relay don't click when i turn the key to run? and why there is no power at the fuel pump relay?

the operation of most fuel pumps is controlled by the fuel pressure regulator
when the fuel pump gets to set pressure , the pump is switched of by the ECM at the relay level
maybe nothing wrong with your system just the system working as designed
if you have pressure in the fuel manifold when you turn the ignition on then the pump will not run but will if there is a fuel leak somewhere and the pressure drops off

Oct 25, 2016 | Cars & Trucks

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I want to know how to wire esuse day lights to a mazda cx 5 2014 model

You will need a relay, capable of handling 10A, a breaker (or fuse) that is also 10A, and some automotive power wire of at least 14 awg.
Run a wire from the positive (+) side of your battery (at the starter solenoid if you can access it), to one side of the breaker, and run the other side of the breaker to the primary side of the relay. Shelter all exposed terminals from contacting the chassis. The relay output wires directly to the positive side of the daytime running lights (with the - side of the daytime running lights to chassis for ground), one side of the relay coil to any ignition-switched power source (solenoid ignition connection will work), and the other side of the relay coil goes to chassis ground.
The daytime running lights will automatically turn on when you turn your ignition key on, and will turn off when you turn the key. Using this relay arrangement helps isolate them from other circuits, which they may otherwise overload.

Jul 25, 2014 | Cars & Trucks

1 Answer

Chevy blazer problems

Does sound like the fuel pump if it started after tapping on it,but the security light is a different problem. That will also kill the fuel,but if you drove it home,that problem must have started after you got home.Not sure what year it is but if it has a chip in the ign. key,try a different key,if there is no chip run the pass key relearn .
Takes about a half hour,make sure the battery is fully charged and try to kill the daytime running lights if possible,(maybe set the parking brake,some trucks that shuts off the DRL)
Then crank the engine,leave the key on(as if it was running) after about 10 min the security light should go out.When it does turn the key off and crank it again,same deal,key left on for 10 min. till the light goes out. Have to do this 3 times ,should start on the 4th attempt. That will reset the security , but if the pump is bad it still may not start,the security light should be out tho.
When the pumps wear out the brushes you can get them to run once or twice by tapping on the tank,sometimes,but it sounds like a pump as in order.

Dec 25, 2013 | Cars & Trucks

1 Answer

My 2005 chevy malibus radio wont turn on

hmm. you have automatic daytime lights? really people need to look into this issue. there are 2 power sources. 1 is always hot. which will be the battery lead the other will be power lead to ignition or automatic daytime running light. if your in your car turn on the ignition and shut it off. radio should still be on until either A. the door opens on drivers side or daytime lights shut off.

Dec 03, 2012 | 2005 Chevrolet Malibu

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Fuel pump relay fault Can't find relay. No power to fuel pump. Checked fuses. All good

Model? Year?

Check per owner manual to be sure inertia switch is not tripped. Remember, fuel pump only runs for 5 seconds when key is turned ON, then it shuts off if engine is not running. Pump always runs when key is in START position.
Listen for pump to run inside fuel tank for 5 seconds after key is ON.

The PCM power relay turns on the PCM and the PCM turns on the fuel pump relay, which turns on the fuel pump.

See owner manual forfuse & relay charts.

Apr 06, 2011 | Ford Expedition EL Cars & Trucks

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Fuel pump not getting power.Replaced fuel relay and pump. computer code was reading cam position sensor. I dont believe that would cause a no power to fuel pump. It is trying to turn and it will turn with...

If it is similar to Quest, the fuel pump runs for 5 seconds when you turn the key to ON. Then, unless the engine is running, the pump shuts off. It runs when the key is in START position though. Can you hear the pump run for 5 seconds when you turn key to ON? Listen carefully for the hum of the pump in the tank.
Normally, the power relay powers up the PCM and it applies power to the fuel pump relay. Then you get power to the pump.
Also, look at owner manual for all fuses that apply to fuel pump system.

Jan 05, 2011 | 1998 Nissan Pathfinder

1 Answer

I have a 1994 Chev. C1500 2wd P/U 5.7 liter V8. Runs fine during daytime when good weather. At night or if there is a change in the weather such as rain, the truck stalls when stopping at a stop sign or...

Test the fuel pressure. With gauge connected to the fuel rail turn key on, listen for pump, when it stops,turnthe key off and leave gauge connected for an hour. The original reading should been 50lbs., if it drops any more than a couple of pounds the pump is bad. The M.A.P. sensor sounds like it was another item in itself.

Oct 09, 2010 | 1996 Chevrolet K1500

1 Answer

93 gmc sierra 5.7 liter engine, injection carb, will turn over won't start, replaced fuel pump fuse, replaced fuel pump relay, replaced fuel pump inside gas tank, no gas flow to carb , gas gauge has always...

you say you replaced the fuse, but does the fuse have power? the gray wire at pump should have power when cranking, or for 2 seconds when turning key on. At fuel pump relay, put power onto gray wire, the pump should run if the wiring is good. if it doenst run then ck for power at fuse while power is on gray wire.

Oct 19, 2009 | 1995 GMC Sierra C1500

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