Question about 1997 Chevrolet Venture

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No power to fuel pump relay

Wont run

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Swap relays or put meter on terminals where it plugs in to see if it is actualy getting power, if not , check fuse,

Posted on Feb 17, 2012

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My 2005 l200 wont start but if you run a lead from battery to switch on pump it starts take lead of and it stops new switch on and still no start.


The fuel pump is powered from a relay. That relay is powered by the engine's computer ("ECU"). The relay is necessary to scale the low current control signal from the ECU into a high current switch to operate the fuel pump. The high current circuit will likely contain a fuse. That fuse or the fuel pump relay may be defective.

The fuel pump relay is activated for a few seconds when the ignition is turned on before starting the engine. If everything is working properly, you should be able to hear the fuel pump run for those few seconds before starting the engine. This is so the injectors have adequate fuel pressure before the engine is started.

Apr 11, 2014 | Mitsubishi Pickup Cars & Trucks

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1998 chevy blazer fuel pump wont shut off how do


I don't think you can on that vehicle-probably not a code, anyway. Check the fuel pump relay, it may be stuck on. Should be located in the power distribution box under hood. Pull it out-pump should stop-swap in a different relay to test. If pump still runs on with new relay, the wiring to the relay needs checked.

Sep 10, 2013 | 1998 Chevrolet Blazer

1 Answer

1991 suburban...will only run for 4 sec than turns off...i have replaced the fuel filter, pump,the fuel relay,,,,still wont stay running


I would bypass the relay and power up the pump then check fuel pressure at the injectors. The pump may not have power after the relay turns off.
You may also be loosing power to the ignition module or coil.

Jul 18, 2012 | 1991 Chevrolet Suburban

1 Answer

Turns over and over can hear fuel pump come on will start with starting fluid and runs great but when shut off for a little while wont start again only with starting fluid


If the starting fluid works then you have a fuel pump or a fuel pump relay issue. The fuel pump relay allows the pump to come on for about 2 secs and prime the fuel system. Once the engine starts then the power to the fuel pump runs through the oil pressure circuit.
If the car starts on starting fluid and then continues to run... I would lean toward a fuel pump relay issue. Hope this helps, Good Luck!

Aug 18, 2011 | 1996 Chevrolet Tahoe

1 Answer

No power on fuel pump in buick century 93, i changed the relay & fuse is ok, that always happen after the car became hot ,next day it wont start


If the fuse and relay is good, and there is power AT the pump, then the pump is bad. Fuel pump power goes through the oil pressure switch but only after engine is running. So there should be power to the pump for approx 2 seconds when you turn key on. There is a RED wire (prime, it will be a single wire poking out near relay) at the fuel pump relay, if you put 12V on that wire the pump should run, IF the wires and pump is good. The GRAY wire powers the pump.

Aug 04, 2011 | 1993 Buick Century

1 Answer

Fuel pump runs and dont run at times wont start


First thing would be to either test or replace the relay which is under the hood. Do check the fuse as well. you can test power to the relay and also to the pump with a voltmeter. You can test the relay itself with an ohmmeter.

Jun 08, 2010 | 1988 Mercury Sable

1 Answer

1991 pontiac 2.5 tech 4 fuel pump relay wont energize


Look for a bad fuse or relay. If both check out, most likely an ECM problem

Mar 07, 2009 | 1991 Pontiac Grand Am

1 Answer

95 pathfinder running issues


check the fuel pressure regulator

Jan 28, 2009 | 1995 Nissan Pathfinder

1 Answer

1996 tahoe wont start


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.

Nov 01, 2008 | Chevrolet Tahoe Cars & Trucks

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