Question about Cars & Trucks

1 Answer

Why am I not getting any current from the fuel pump connector at the fuel tank, key switch on and test light grounded but no power at connector

Started out swapping relays around before getting to dropping the gas tank. gas tank out and no power signal form wires connected to the fuel pump

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 75,797 Answers

The fuel pump only gets power when the engine is cranking over or it is running of course. Jumper the relay to test the line.

Posted on Dec 30, 2016

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Replaced upper intake now car will crank but not start. starts when starting fluid is used in throttle body and I don't here fuel pump running when key is in on position


with someone trying to start the car hit the fuel tank and if it starts then the fuel pump is bad. also check to make sure all electrical connections were reconnected after the intake.

Mar 22, 2015 | 1998 Pontiac Bonneville

1 Answer

Wont start fuel pump


Hi Louis, I'm AL the owner of Big As Auto Repair in St Charles Mo

Louis, the best way to check power to the fuel pump is using a test light and probe the power wire on the connector at the pump, but you'll need to drop the tank a little to get to the connector. NOTE: Run a jumper wire from the battery negative cable to make sure you have a good ground. Touch the power wire while someone turns the key on, if the test light comes on the power is good. BUT, you also want to check the ground wire and here's how you do it. Move the jumper wire from the negative terminal too the positive terminal at the battery, next probe the ground wire at the pump connector, if it comes on then both power and ground are OK and you will need a pump. BUT, if one or the other doesn't come on then you'll need further assistance, please send your family and friends to my website and if you need further help click here: Auto Repair

Mar 18, 2015 | 1998 Dodge Caravan

3 Answers

I have a 2003 Buick Century replaced fuel pump, fuel pump relay fuel pump fuse is no power to the fuel pump what's wrong with the car? Pcm? Key switch where's the relay located


Pull the relay. Using a test light connected to ground probe the four pins in the fuse block. Two of them should have power. Connect the test light to power. Back probe the other two connectors. One should be grounded all the time, this is the power supply wire to the fuel pump. The other should be grounded when the key is turned to the run position and only for about 5 seconds.

Let me know what you find and I'll help you further.

Sep 13, 2014 | Cars & Trucks

1 Answer

I have no fuel pressure where do i start to find the problem


Okay, hey, the fuel pump circuit. With key on, the pump should turn on for about two seconds to put pressure in the line and in the fuel rail on the engine, where the fuel injectors are. When the engine is cranking, the pump is turned on again by the vcm (Vehicle Control Module-the engine computer) signaling the fuel pump relay, just as it did with key on. After the engine is running, the pump is kept on, usually by the oil pressure switch.
No fuel pressure? Then the pump is not turning on, or the fuel filter is completely blocked-which is rare.


You can start at the Underhood Fuse Block. Here is found the fuel pump relay and the fuse for the pump. The fuse is designated ECM-B Fuse and it's 20 amp. If the fuse is good, put your finger on the fuel pump relay. Now have a helper turn the key to on, not start. If the circuit is good to this point, you should feel movement- a slight click. If you feel nothing, and the fuse is good, then the VCM is not sending a signal to the relay OR there is a wiring problem from one side of the relay to ground. If no click or movement under your finger-you will need professional help to diagnose further-checking of the signal from VCM and/or checking the ground wire for that side of the relay.
If you definitely feel a click at the pump relay, and the fuse is good, the power to the pump is sent out from there on a gray wire. Get under the vehicle at the rear and find the electrical connector for the gas tank, and pull it apart. Now you need a test light or voltmeter to check for power on the gray wire in the connector. You might miss the two second signal with key on, so have your helper hold the key in start. While the engine is cranking, the gray wire should have power-battery voltage. If it does not, big problem: possibly a broken wire or short from pump relay to there at the gas tank.

If the gray wire has power with engine cranking, you're almost home: Either the pump has definitely failed OR the ground for the fuel pump is bad. The ground wire is black and it shares the same ground point as your rear exterior lights, so if the lights work, the ground can be assumed to be good also for the fuel pump. And then you need a new fuel pump. But check the gas tank connector carefully for any sign of corrosion, loose terminals, anything like that amiss. Not likely, but check anyway-you don't want to put in a new pump and then find a loose connection! Good luck.

May 05, 2014 | 1999 Chevrolet Blazer

2 Answers

88 chevy 350 with no fuel pump and no injector pulse


The fuel pump circuit and injector circuits are fed by two different fuses.
The fuel pump relay and injectors are controlled by the computer. Have you checked both ECM fuses for power ?

Apr 10, 2013 | 1988 Chevrolet K1500

1 Answer

I have a 1992 ford f150 and it is not geting power to the fuel pump, however i had the fuel pump and relays teasted and they are good. What could be the problem?


Hi, your circuitry is shown below. The relay coil is powered by the PCM relay but get's it's ground turn-on from the PCM separately. There is an intertia switch in the power circuit, and If you have dual tanks, there is also the tank switch to worry about. What I would do is interrogate the pump relay socket to see what's going on. Pull the relay out and use a 12 volt test light as follows:

Connect the test light clip to chassis ground, and probe the relay socket. You should get one hot terminal from the 20 amp fuse O. Next, turn the key on and probe the socket again. You should have 2 hot terminals, the additional one coming from the PCM relay.

Next, move your test light clip to battery positive and probe the socket again. With the key still on, you should get a light from the PCM ground signal. This is the one that is usually a problem. If you don't get this light, the PCM is not turning the pump on (perhaps due to a security system) or you have a bad wire from the PCM (pin 22) to the relay.
There is also usually a dim light on the last terminal (that goes to the pump). If you don't get that dim light, your inertia switch or tank switch may have failed open.

Please let me know if you have questions and thanks for using FixYa.


jturcotte_1310.gif

Mar 24, 2011 | Ford F-150 Cars & Trucks

3 Answers

1989 astro van turns over will not start seems not getting fuil gas tank full


#1 NEED TO VERIFY SPARK AT SPARK PLUGS # 2 CK FUEL PRESSURE AT SCHRADER VALVE ON FUEL RAIL ,,PRESSURE DEPENDS ON TYPE ENGINE ....IF NO SPARK AT SPARK PLUGS CHECK SPARK FROM COIL WIRE , IF NO SPARK AT COIL ,CHECK VOLTAGE TO IGNITION COIL SHOULD BE 12 VOLTS, IF NO VOLTAGE AT COIL ( KEY ON ) CHECK FUSES THEN IGHITION SWITCH. IF NO FUEL PRESSURE AND FUEL PUMP RUNS REPLACE PUMP .. CK VOLTAGE TO FUEL PUMP WHILE CRANKING . CK USING PUMP GROUND WIRE AT THE PUMP CONNECTOR THIS WILL PROVE GROUND ALSO. USE TEST LIGHT TO VERIFY

Aug 07, 2010 | 1989 Chevrolet Astro Cargo

1 Answer

How do i change the fuel pump for a 1991 buick regal and how can i tell if it is the fuel pump


turn the key on without starting the engine and listen for the fuel pump to make its 2 or 3 second fuel prime,, you may have to listen carefully, if you dont hear it, check the fuel pump fuse 10 amp red fuse. If its ok check for power at the connector leading to the top of the fuel tank, with it unplugged test with a test light the harness side of the connector between the grey wire and ground for power, the test light should light up when you do the fuel pump prime test again, light will come on for 2 to 5 seconds, if it does replace the fuel pump in the fuel tank >>note if you can hear the pump in the first test, pressure should be around 35 psi .

Nov 24, 2009 | 1991 Buick Regal

2 Answers

Three fuel pumps have failed in the past four


do an ohms test on wiring loom if any higher than approx 5ohms when everything is disconnected bad connection. this can still show good voltage but pump not getting enogh amps(current) so it burns out windings in pump
are old pumps open circuit?
test with ohms meter
if so check that wiring and connector pin tensions

Jun 27, 2009 | 1993 Isuzu Trooper

1 Answer

Rear, fuel pump failed, so i switched to the front tank. the truck ran rough for a week. then the front fuel pump went out. when I volt test at the plug atop the tanks, with the key in the on position I...


sounds like a bad ground or short to the signal wire what you can do is trace the wires from the tank to the bulk head connector to check for brakes in the wire but first do a ohm test on the three wires with the key off there is resistance between the wire you have a short if not check for brake or corroded connections

Mar 07, 2009 | 1990 Ford F250

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

19 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

75797 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...