Question about 1990 Chevrolet K1500

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1996 chevrolet truck wont start after sitting overnight. no power at the control side of the fuel pump relay socket when the key is turned on.what could cause this?

If I use starting fluid the engine will start and run fine. only when its left overnight it wont start. just cranks over. I have constant power on one pin and a good ground showing on another. just no power on the control pin when the key is turned on.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1994 S10 Blazer Fuel Issues?

YOU SHOULD INSTALL ORIGINAL GM PART AND NOT AFTER MARKET. I INSTALLED 2 AFTER MARKET PUMPS THEY WORKED FOR A WHILE THEN STOPPED. THE PROBLEM WAS NOT ENOUGH PRESSURE, SINCE I INSTALLED GM PART NO PROBLEM.......

Posted on Jun 27, 2009

  • 497 Answers

SOURCE: what causes 350 on a chevy c1500 1996 to start

Sounds like a poor idle. try adjusting the idle screw.

Posted on Aug 09, 2009

  • 10 Answers

SOURCE: 1998 chevy c15 5.7 SFI SYSTEM

My truck did this after I replaced the fuel pump. Turned out to Fuel Pressure Regulator. It would crank and crank but never start. It's located underneath the black plastic manifold on the side of the injectors.

Posted on Feb 19, 2010

duane_wong
  • 6826 Answers

SOURCE: 1996 4.3 vortec S10. Cranks

The plenum shouldn't be damp with gas. Is it a throttle body fuel injection system?

Could be a leaky injector.

Fuel Meter Body & Fuel Injectors (4.3L Engine) Removal & Installation 1995-2002 Models (RPO L35) To Remove:
4.3L (RPO L35) Fuel meter body assembly gm_trk_sil15_02-04_43_fuel_metr_body_assy.gif

  1. Before servicing the vehicle, refer to the Cautions and Warnings in the beginning of this section
  2. Remove or disconnect the following:
    • Upper intake manifold (See: Upper Intake Manifold)
    • Fuel meter body
    • Injector retainer lock nuts (J) and retainer (K)
    NOTE: Use care in removing the fuel injectors to prevent damage to the electrical connector terminals. The fuel injector is serviced as a complete assembly only. Also since the injectors are electrical compartments, these injectors should not be immersed in any type of liquid solvent or cleaner as damage may occur. Fuel injector cleaning is not recommended.
  3. While pulling the poppet nozzle tube downward, push with a small tip punch down between the injector terminals until the injector is removed
To Install:
4.3L (RPO L35) Fuel meter body assembly gm_trk_sil15_02-04_43_fuel_metr_body_assy.gif

Note: When ordering new fuel injectors, be sure to order the correct injector for the application being serviced.
  1. Lubricate the new injector O-ring seals with clean engine oil.
  2. Install or connect the following:
    • Fuel injector (L) into the fuel meter body injector socket
    • Retainer (K) and injector retainer lock nuts (J) and tighten the nuts
      1. Torque to: 27 inch lbs. (3 Nm)
    • Fuel meter body
    • Upper intake manifold (See: Upper Intake Manifold)
  3. Test drive the vehicle to confirm the repairs.
1993-2005 Models (RPO LU3) To Remove:
4.3L (RPO LU3) Fuel meter body assembly gm_trk_sil15_02-04_43_rpolu3_fuel_metr_body_assy.gif

  1. Before servicing the vehicle, refer to the Cautions and Warnings in the beginning of this section.
  2. Remove or disconnect the following:
    • Upper intake manifold (See: Upper Intake Manifold)
    • Fuel meter body
    • Injector retainer lock nuts (J) and retainer (K)
    NOTE: Use care in removing the fuel injectors to prevent damage to the electrical connector terminals. The fuel injector is serviced as a complete assembly only. Also since the injectors are electrical compartments, these injectors should not be immersed in any type of liquid solvent or cleaner as damage may occur. Fuel injector cleaning is not recommended.
  3. While pulling the fuel injector downward, push with a small tip punch down between the injector terminals until the injector is removed
To Install:
Note: When ordering new fuel injectors, be sure to order the correct injector for the application being serviced.
  1. Lubricate the NEW injector O-ring seals with clean engine oil
  2. Install or connect the following:
    • Fuel injector (L) into the fuel meter body injector socket
    • Retainer (K) and the injector retainer lock nuts (J) and tighten the nuts
      1. Torque to: 27 inch lbs. (3 Nm)
    • Fuel meter body
    • Upper intake manifold (See: Upper Intake Manifold)
  3. Test drive the vehicle to confirm the repairs

Posted on Jan 29, 2011

  • 226 Answers

SOURCE: where is the fuel pump relay located an which fuse

try to smack the gas tank with a rubber mallet with someone cranking the key .if it starts then the pump is no good .otherwise the relay should be on the pass side of the firewall.poss under a long black cover.the fuse will be in the fuse box under the hood on drivers side. var fctb_tool=null; function FCTB_Init_0b704873de9943d2aa9b1abbb4656a28(t) { fctb_tool=t; start(fctb_tool); } FCTB_Init_0b704873de9943d2aa9b1abbb4656a28(document['FCTB_Init_72d341bf61da4120a5167e6de35ebcf0']); delete document['FCTB_Init_72d341bf61da4120a5167e6de35ebcf0']

Posted on Feb 06, 2011

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1 Answer

Hard to start in mornings


A common cause is a faulty check valve in the pump. The check valve prevents fuel pressure from draining back into the tank. The pump gets power from the relay for only 3 seconds during crank which would not be enough if the fuel line has zero pressure. You could cycle the key on and off a few times and probably start it quicker if that is the problem.
Have the fuel pressure checked after sitting overnight.

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the ecu controls the power to the pump and injectors. are you getting error on every test on reader that can be the ignition relay. its in the dash when you turn the key should hear it go click click. if just one click then one side of it has gone. there is the low volt side, ignition interior dash lights etc. high volts is ecu abs, air bags. etc. low volts go to the abs and ecu but when engine started it needs the high volts to be there to run.

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The fuel pump power to the relay is powered by the PCM BAT fuse 15amp.
The relay is grounded and the PCM powers the relay to turn it on and power the pump.
You should have power on the orange wire with the key on.
The PCM powers the relay when the key switch is in the start position and after the computer sees oil pressure and RPM.

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Losuing over drive lack of power hard starting must hold pedal to the floor


Does it start better after sitting overnight? Is it missing at all? Check engine light? Hard starting could be fuel pump, also lack of power could be lack of fuel. If it starts better after sitting overnight, could be block catalytic converter. That would also explain lack of power. If you have to hold gas pedal half way down trying to get speed would explain why it is not going into overdrive. Hope this gives you some direction.

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I have a 98 chevy venture...i am not getting any power to the fuel pump and was wondering if there is a safety shut off or if my problem is with the pcm...had to disconnect the negative terminal on the...


If your security light is on, then this is the problem. The security has it's own module, not in the radio. Turn the key on (don't start) let it sit for ten minutes, turn it off for five seconds and then try to start the car. This resets the security. To check the fuel pump. Find the fuel pump relay and pull it out. Put a jumper wire in the relay socket at terminals 87 and 30. 30 is power all times and 87 goes to the pump. If you have power at 30 and jump the relay socket and the pump still wont come on. Then either there is a bad wire (power or ground) or the pump is dead.

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Chevy 1996 s10 wont start it turns but that's it we replaced the fuel pump and the crank sensor. Now what do we do.


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What typically is needed to to be done if a 2001 supercrew has had air bags deployed and wont start after that. The switch in the right kicker panel for the fuel pump does not appear to have been tripped....


Good info on the PATS / theft light. Looks to be the PATS / HEC operation is functioning correctly

The Fuel inertia switch only cuts power to the fuel pump, so if tripped, the truck would have a crank no start issue. Do you have a crank no start, or no crank issue.

To reset, just press down on it. To check if the switch is tripped, check for power at the connector to the fuel inertia switch

Engine compartment fuse # 10 ( 20A ) to the fuel pump relay -> Dark Green w/ yellow stripe wire to the fuel inertia switch -> pink w/ black stripe wire to the fuel pump module.
Check the pink w/ black stripe wire to ground with a meter for power, with the key in the run position.

If you turn the key from off to run ( do not start ) you should hear the fuel pump cycle ( hum, then turn off ).

Could be an issue with the fuel pump relay ( my '01 had a crank no start at ~ 35K miles, bad fuel pump relay ). I proved this out ( after a stupid ID10T error in my diagnoses process ) by jumpering the normally open contacts in the fuel pump relay socket, and then installing the trailer tow reverse circuit relay into the fuel pump relay socket ( same full size Ford Relay ).

Jumpering the fuel pump relay in the relay socket ( remove relay and use jumper wire ), red line
sscullys_16.jpg

If you have a no crank issue, could be the DTR ( Digital Transmission Range ) sensor on the driver's side of the trans is out of alignment.

Check the start motor relay ( on the firewall on the passenger side ) for power on the Tan w/ Red stripe wire when the key is in the start position ( this is from the ignition switch through the DTR when in park or neutral to the starter motor relay ).

You can test another route, turn the key to the run position, and apply power to the Tan w/ Red stripe wire on the starter motor relay in the engine compartment on the firewall. BE CAREFUL, the motor should turn over, keep clear of moving parts.

Post back a comment to this problem with the results of the testing.

Thanks

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1996 Chevy Lumina wont start. Relay fuse on passenger side under hood clicks. tried replacing it, wont start. but if you wait 8 hours, a day or two, and try, it fires fine??? The only time it wont run is...


Could be several things....but i need more information. When it doesnt start, does it crank or when u turn the nothing at happens other than the relay?

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There should be a 2 second prime by the fuel pump. This prime by the fuel pump is standard for GM vehicles, and if it is not present a hard start is encountered. Turn the ignition to the run position and listen for the fuel pump operation. You may have to have an assistant listen at the fuel filler by installing a long slender funnel into the fuel inlet to the tank, remove the gas cap and insert the funnel, listen at the large end of the funnel to see if the pump can be heard running. Using the funnel acts like a megaphone and makes it easier to hear the pump. If the pump runs for 2 seconds after you turn the key to the run position (DO NOT attempt to start the engine during this test) and the engine doesn't start due to lack of fuel, check for an obstructed fuel filter. (Just change it, it's probably overdue for service anyway since everyone thinks it get changed during oil changes, but never really does.) If the pump doesn't run during prime interval, the computer may not be turning on the fuel pump relay, or the relay is defective. To check the relay, use another of the relays in the power distribution box to substitute for the suspect fuel pump relay and retest. Be sure to wait at least 30 seconds between key cycles since some systems have a delay timer built in to keep the pump from over running. Be sure the relay you sub into the fuel pump socket is identical to the one you remove and properly oriented in the socket. The engine will run following your manual prime because an additional set of contacts in the oil pressure switch will power up the fuel pump relay once proper oil pressure is achieved by an idling engine. If you find that the relay is not defective, but doesn't provide a priming impulse, the engine computer may have failed. DO NOT use a conventional test light with a filament type bulb to check any of the computer circuits that drive the fuel pump relay, or any other computer controlled circuits on an automobile ( or pickup) The driver circuits in a vehicle computer can be blow-out by over-current when using a conventional test light. You can use a high-impedance DVOM for testing safely.

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