Question about 2001 Chevrolet Express

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No power to fuel pump

New fuel pump installed. Fuses and relays good.wireing seems ok.Heard that maybe a sensor in distributor? Computer ?

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Go to a near by workshop

Posted on Jul 18, 2009

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I have a 1987 ford ranger the engine turns over but it wont start


Spark at plugs? Fuel filter? Pressure on injector delivery line? Pressure relief valve? You may be able to measure fuel pressure at the pressure relief valve location. and return line. If you have spark, I'd say it's a fuel supply problem

Dec 21, 2014 | Ford Cars & Trucks

1 Answer

No power to fuel pump


If the old fuel pump failed, it may have blown a fuse or damaged a relay, so check those first. Your owner's manual should show where to find them. Usually, you can borrow a relay from another circuit for testing purposes.

Then, you need to determine if the wire from the engine compartment to the fuel pump is receiving power. A $3 test lamp with thin probes at each end should answer that question. While the engine is cranking, touch one end to what should be a "hot" connection and the other end to a good ground -- if the lamp lights, you've got juice.

If the wire has power, then check connections at the fuel pump that may have been mis-wired or come loose. If you have to remove the fuel pump to do this, hook it up directly (and briefly) to your battery to see if it runs ... even brand-new fuel pumps have been known to be defective.

If you're satisfied that the wiring, pump, connectors, fuses and relays are all OK, then the engine computer probably isn't activating the fuel pump relay for reasons best known to itself. Assuming the computer itself is receiving power (check fuses and relays), then you'll need to do some systematic electrical diagnosis, since there are many sensors that influence the computer's decision-making process.

Your best bet is to find an online forum for your truck. Since it's such a popular vehicle, there's likely to be many forums ... with other people who have encountered similar problems, and solved them. A factory service manual also may help to troubleshoot electrical problems.

Apr 11, 2014 | 2004 Ford F150

1 Answer

Put in new fuel pump,fuses are OK,new fuel pump relay and still no power to the fuel pump


Get a test light and test the wires going to it ground one end and see if you have power at the pump. If not do the same at the fuses so where you are not geting the power.

Aug 19, 2012 | 1998 Pontiac Grand Prix

1 Answer

Our volvo estate its a 740 GL cutting out when we are driving, wont restart until after a minute or so then fine


#1 suspect is the fuel pump relay. Can you hear the fuel pump spin up for a second when you turn the key to the On position? If not, check fuses for fuel pumps. On a 240 it is fuses #4 and #6, but I am not sure about on a 740. Pull them out to examine them because the tips tend to corrode off fuses this old, so they can fail and still look OK until you pull them out.
If the fuses are good, take a paper clip and jumper between the fuel pump fuses. If the fuel pump hums and the car starts, the fuel pump relay is failing to close. That relay should be up under the dash above the passenger's right foot. Look it up on a parts website so you know what it looks like. If a new fuel pump relay will not close either, then we go to the #2 suspect, which is the engine computer. The computer should be behind the kick panel to the right of the passenger's right foot. The typical failure mode for the computer is that the transistor that supplies the ground for the fuel pump relay fails. Do NOT defeat thissafety feature by simply grounding the fuel pump relay. If the computer has failed, get a rebuilt computer (available from many suppliers)
#3 suspect is the lead on the crank position sensor. Take a light and maybe a mirror and look at the wire that runs down between the engine and the firewall to the sensor that is attached to the top of the bell housing. If the insulation is blistering off that lead, the sensor must be replaced. This is not a bad job if you have really skinny arms and really small hands, and the sensor has not rusted in place. Do NOT drop the 10 mm bolt that holds the sensor into the hole the sensor goes in, or you will not like yourself. The reason this was not the #1 suspect is that unless this is a very low mileage 740, this sensor has almost certainly already been replaced, and the replacement sensors are better made and last forever.

Aug 18, 2011 | Volvo 740 Cars & Trucks

1 Answer

My volvo 240 1991 was running fine and now it turns but wont start


#1 suspect is the fuel pump relay. Can you hear the fuel pump spin up for a second when you turn the key to the On position? If not, check fuses #4 and #6. Pull them out to examine them because the tips tend to corrode off fuses this old, so they can fail and still look OK until you pull them out.
If the fuses are good, take a paper clip and jumper between the #4 and #6 fuses. If the fuel pump hums and the car starts, the fuel pump relay is failing to close. That relay is up under the dash above the passenger's right foot. Look it up on a parts website so you know what it looks like. If a new fuel pump relay will not close either, then we go to the #2 suspect, which is the engine computer. The computer is behind the kick panel to the right of the passenger's right foot. The typical failure mode for the computer is that the transistor that supplies the ground for the fuel pump relay fails. Do NOT defeat this safety feature by simply grounding the fuel pump relay. If the computer has failed, get a rebuilt computer (available from many suppliers)
#3 suspect is the lead on the crank position sensor. Take a light and maybe a mirror and look at the wire that runs down between the engine and the firewall to the sensor that is attached to the top of the bell housing. If the insulation is blistering off that lead, the sensor must be replaced. This is not a bad job if you have really skinny arms and really small hands, and the sensor has not rusted in place. Do NOT drop the 10 mm bolt that holds the sensor into the hole the sensor goes in, or you will not like yourself. The reason this was not the #1 suspect is that unless this is a very low mileage '91, this sensor has almost certainly already been replaced, and the replacement sensors are better made and last forever.

Jul 30, 2011 | 1991 Volvo 240

3 Answers

Truck will not start, has fire. relay ok. no trouble codes.


when you turn the key in 'on' position, do you hear the fuel pump hum? check under hood in black box,,fuses,,and relays. for bad fuse or fuel pump relay bad. try bumping fuel tank with something hard to see if fuel pump will engauge with key on. maybe bad pump. have you had off road? look for pulled plug from fuel pump underneath near gas tank.have you bent or damaged your igbition key somehow? the key sends a signal to your cars computer to engauge the pump and crankshaft sensor.but if you do have fire,,,it's a fuel problem, so you are on the right track. if nothing i've said helps, check for a bad fuel pressure regulator.hope this helps and thank you for choosing fixya.com!!

Nov 19, 2010 | 2001 Dodge Durango

1 Answer

No start


Okay, lets start with fuses, check all your fuses, then move on to scanning the computer for any stored codes, like pcm codes as chrysler has had computer problems, and make sure power wire from battery to fuse/ relay box is good and clean, then check your auto shut down relay maybe swap with a known good one, then last dis connect all injectors and check for a shorted one.

Jul 12, 2010 | 1999 Dodge Caravan

1 Answer

I have a 1991 740 volvo, was driving down he street and it died,after i pulled over it wouldn't start


Check if you still getting fuel and sparks, two items need to keep the car running. Check fuses and fuel pump relay, if needing new relays go to the junk yard and get couple of them for nothing. Checking making sure you getting fuel and fuel pump working properly, unplug the the main coil wire to distributor so the car wont start we just want the engine just to turn over. under the hood, locate fuel filter, disconnect the line to or from it, wrap the bottom of the hose with old clothe firmly and to remember to point the house downward away from your face so it wont splash at you. and have a friend turn ignition over just like starting, see if the fuel come out with good pressure. if fuses and relay check out, your crank sensor may be bad, being 91' strong possibility. crank sensor send info to computer telling to send fuel to your injectors. For sparks, make sure you plug the main wire to distributor back. pull one plug wire and get spare plug, plug it and ground the plug and have a friend turn the engine over and see if you getting sparks, do not touch the plug, big shock. No sparks, check the coil if you getting 12v, if yes, than your cam sensor is faulty. The cam sensor work just like the crank sensor but telling the computer to send sparks to the distributor. Common for older European cars, crank and cam sensor tend to become faulty after years of service due to age and heat abuse.

Aug 09, 2009 | 1991 Volvo 240

1 Answer

1992 bravada,cranks-no start, missing fuel pump


You can try to test the relay for function by swapping it with a known good working relay. If this does not work, you can put a jumper between the terminals that energize the pump (relay removed, ignition off). (On the Bosch Jetronic systems I used to work on, the pump would energize even with the ignition off). If there is still no sound, briefly turn the ignition on, and listen for the pump to energize. If you heard nothing, assume the pump is defective. I found most fuel pump problems and failures to occur in vehicles with 125,000 to 175,000 miles of use.

You may also try to check the Hall effect sensor ( a magnetic pulse detector that controls both spark and fuel flow) located within the distributor body (where the spark-plug wires attach to the distributor.

And finally, if that is good, check the ignition module within the distributor. It's a sealed transistorized circuit bolted to the inside of the distributor body with 5mm bolts.

Mar 26, 2009 | 1992 Oldsmobile Bravada

1 Answer

Not getting fuel


if you have a 1.8-2.7- or 1.2 engine change the distributor cap and plugs and wires check timing also .it could be problems with the led photodiode in distributor. for the 2.2 and 3.3 it distributorless they have crank sensor and cam sensor. you will need a scanner to check those sensors. check to see which one of theses engines your vechicle have. go from there . your fuel pump relay should be in the engine compartment.

Mar 10, 2009 | 1988 Subaru Justy

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