Question about 2001 Chevrolet Silverado 1500

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Truck would not start and fuel pump was not running fuses ok towed it home checked wires and ground wire and put key in to put in neutral and pump suddenly started running and truck started. What could cause that

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You may have a short in your wring somewhere. Sounds like that could be the case. Finding a short could be a real pain in the behind though.

Posted on Jul 05, 2010

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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

1 Answer

I replaced the turn signal switch and now it wont start. i can hear the fuel pump kick on. makes no sense


You said you hear the pump come on, then said fuel pump not running ???
Check the fuse for the pump, preferably with a test light to verify power is there. Key must be in on position. If the fuse is powered, feel for the fuel pump relay to click when you turn key to on. Put your finger on it while someone turns key to on. If it clicks, check for power at the tank connector on the pump wire, while the engine is cranked. If power there when cranking, the pump must have failed and needs replacing. If the relay clicked with key on, and no power at the pump wire at tank while cranking, then check wiring from relay to pump connector-the fuel wire may have broken.
If the relay doesn't click when key turned on, check for the power feed for the pump at the relay terminal. If the relay has power available to be transmitted to pump, then the relay's signal from the computer or the ground side of the relay's coil signal (from the computer) may need checked.
If the pump is working, and you have good pressure in the lines, check the injector circuit. Also a fused circuit, so check the fuse first. The injector should have a steady voltage signal to it with key on. The injector only has two wires, the power wire and the ground wire which goes to the computer. When the computer momentarily grounds the injector circuit, the injector "pulses", causing fuel to spray out the bottom.

Apr 15, 2013 | 1988 Ford F 150

1 Answer

Why does my 1988 gmc truck turns off when driving


fuel pump, or fuel punp relay mounted on fire wall, check the fuse in relay, also check the ground wire from fuel pump (in tank) to the inlet pipe , under the truck, where you put gas in, fuel pump needs a good ground period. fuel pump could be on its last leg ! reason why I know this is cause I have a 1988 gmc 3/4 ton. to access fuel pump, I cut an access opening in truck bed, 12" square above tank at location of pump. better than dropping tank, besides the truck is how old ? makes a hard job easy. change your fuel filter also. good luck, ken

Jan 12, 2013 | GMC C1500 Cars & Trucks

2 Answers

2001 blazer wont crank, headlights come on when key is off,can get truck to run after taking cover of starter relay,and fuelpump relay turn key on, and manually push relays to start.


At the moment, I'm only talking about starter relay. The starter relay has two sides, the load side and control side. The load side is that line with arrow, terminal 30 and 87, terminal 30 is hot all the time, plus, see that fuse on the load side. If you unplug the starter relay, key in the on position, on position is where dash lites come on, Then use jumper wire between terminals 30 and 87, at the least it should crank the starter motor and it might start. If you try that, make sure tranny is in park or neutral and parking brake is set.
If you get a reaction, the problem should be on control side of starter relay, right side in the picture. Terminal 85 and 86, the control side needs voltage and ground. You can see crank fuse, goes hot with key in the crank position, not only check fuse check for voltage on fuse circuit. As you can see, on the control side the neutral or clutch switch, depending on the tranny, is involved The ground for the control side is a chassis ground. As far as the fuel pump, other than the initial prime, fuel pump will not run w/o rpm signal, you have to crank it to get rpm signal.
starter relay-cyhsnjevi1lis2padjpmzkvw-3-0.jpg

Jun 30, 2017 | 2001 Chevrolet Blazer

2 Answers

1995 nissan pickup truck fuel problem


Fuel injected or carb? Make sure fuel line itself is clear. Some pumps are designed to self regulate (carb systems) some continually pump and a psi regulator sends back the excess fuel back to the tank (fuel inj systems) If the line is obstructed then pump can't deliver fuel fulltime.

If you think pump is not on consistent, try running a dedicated wire through a switch directly to the pump. If it works then you are looking for an electrical fault going to pump. Good luck.

Mar 10, 2010 | 1995 Nissan Pickup

1 Answer

Fuel pump wont run with key in on position but


first thing to check power at the plug at the pump itself if you have 12 volts there, make sure the ground wire has a good connection at the frame rail,if thats good the pump wire that runs thru the fuel pump hanger maybe broken

Jul 13, 2009 | 1992 Chevrolet K1500

1 Answer

2001 chevy s 10


Find power wire coming from relay to pump when key switched on, & follow it back to pump. If you have power out of relay & nothing at pump, then I'd look for a break in wire to rear, or just run a new one. Double check your ground as well.

Jul 05, 2009 | 2001 Chevrolet S-10

2 Answers

Truck wont start, new battery, good fuses, bench tested starter they say its good, cables look ok.Turn ignition and dash lights come on can hear fan motor running.


test starter solinoid wire from harness, with a helper put test light on wire get friend to turn key to start, light should light up, wires at the bottom of engine may (look) fine

Apr 25, 2009 | 1989 Chevrolet C1500

2 Answers

Fuel pump?


This is almost for sure a connection problem, check the relay for the fuel pump.

Nov 25, 2008 | 1998 Chevrolet K1500

3 Answers

EFI fuse blows


You have a short in one of your fuel injector wires. Check the wires from your fuel injectors for burns or cuts, look for bare wires grounding out on medal

Jun 30, 2008 | 1992 Toyota Pickup

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