Question about 1998 Chevrolet Blazer

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Will ignition module make fuel pump not work

Fuel ump wont run

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  • Chevrolet Master
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Autoshutoff relay.. it controls both systems..

Posted on Jan 22, 2013

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Replace egr valve still wont start


PROBLEM COULD BE FAULTY FUEL PUMP OR IGNITION MODULE.CHECK FUEL PRESSURE SHOULD BE 41 - 47 PSI. IF NO FUEL PRESSURE TO LOW REPLACE FUEL FILTER.STILL LOW FUEL PUMP FAULTY.IF FUEL PUMP DONT RUN CHECK FUSE AND RELAY.IF FUSE RELAY GOOD PUMP BAD.IF FUEL SYSTEM OKAY USE A SPARK TESTER TO CHECK FOR SPARK AT SPARK PLUGS IF NOT CHECK IGNITION MODULE FUSE IF OKAY IGNITION MODULE COULD BE BAD.USE A CODE SCANNER TO CHECK FOR FAULT CODE IN PCM AND IGNITION MODULE.THIS SAVE YOU FROM SPENDING TOO MUCH MONEY.

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That sounds like a fuel pump problem and you can test that by pulling a vacuum line off from the intake manifold and spray a lot of carburetor spray or brake cleaner in a spray can into the intake manifold through the open vacuum line port (it has to say "extremely flammable" on the can to work and the non-flammable will not work for this test) and then replace the vacuum line and see if the engine will start and run for a few seconds on the spray.

If the engine does start and run then the problem will most likely be the fuel pump, however a faulty ignition module inside of the distributor could keep the fuel pump from running or the fuel injectors from firing and if there is good fuel pressure in the fuel rail, (there should be a schrader valve in the fuel rail for testing) and there is spark out to the spark plugs but the engine still will not start, then the ignition module inside of the distributor would be the likely suspect of the problem.

If the engine does not start then you will need to determine why there is no spark to the spark plugs, and most likely the problem will be the ignition coil or the ignition module inside of the distributor, or there could also be a problem with the ECM (Engine Control Module).



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CHECK BATTERY VOLTAGE FIRST IT SHOULD BE 12.5 VOLTS.IF NOT REPLACE BATTERY HAVE ALTERNATOR CHECKED.IF BATTERY GOOD.HAVE VECHICLE SCAN FOR PCM PROBLEMS - CRANKSHAFT SENSOR PROBLEMS OR CAMSHAFT SENSOR PROBLEMS.IF ALL IS GOOD GET A SPARK TESTER AND FUEL PUMP PRESSURE GAUGE TESTER.IF GETTING NO SPARK PROBLEM COULD BE LOOSE BAT.POWER SUPPLY WIRES AT IGNITION COIL MODULE OR IGNITION MODULE FAULTY.IF FUEL PUMP NOT RUNNING CHECK FUSE ABD RELAY IF BOTH IS GOOD FUEL PUMP FAULTY.

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I have a 91 s-10 that wont run...fuel pump runs and I am getting fuel to the carb all brand new plugs and wires and ignition coil and module and new cap and rotor? fires up and dies out?


The fuel pump relay is at fault. The engine will start running off the oil pressure sensor for the 3rd wire connected to the sensor feeds power to the fuel pump which makes your truck start right up. When the engine achomplish the standard oil pressure as needed the sensor shuts power off by the PCM default system and turns on the fuel pump relay to continue working the fuel pump. replace the relay and you will be driving around again

Mar 28, 2010 | 1985 Chevrolet Chevy

1 Answer

Fuel pump wont work till i cross over relay replaced relay still wont run untill fuel relay is crossed over


The relay is turned on by a "pip" signal from the ignition module. Take your module to the parts store for testing, this is the most likley problem.

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2001 chevy tahoe turns over but wont start


Yes, it's more than likely your fuel pump.

Jul 24, 2009 | 1999 Chevrolet Tahoe

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My 98 dakota wont fire


Check your Automatic Shutdown Relay in your fuse and relay box under the hood by the battery. The power supplied to the fuel pump, ignition coil, fuel injectors,  and parts of the power module is controlled by the logic module through the Automatic Shutdown Relay (ASD); the idea is to shut off fuel pressure and the ignition systems when the key is turned off to prevent fires, dieseling, and other problems.
The ASD relay is closed (allowing power to flow through it) when the ignition is first turned on. If the signal from the ignition reference is lost while the engine is running, the logic module cuts power to the ASD, which in turn removes power from the fuel pump, ignition coil, injectors and those parts of the power module.  This causes the engine to shut down.

The logic module monitors the relay driver.  If it senses that the relay driver is not responding correctly it will trigger a code. If the logic module does not sense an absence of current when the circuit is open, or 12 volts DC when the circuit is closed, it knows that the circuit is open or shorted, and triggers code 42. Failure of the automatic shutdown relay is often shown as inexplicable stalling or refusal to start. Good luck and hope this helps lead you in the right direction. Hint: The ASD can be triggered by a broken wire or short in another place, e.g. the fuel pump. 

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1993 jimmy 4.3 liter wont prime the injectors before statring....if i spray carb cleaner into the intake, it will start and run fine.


I would first change the fuel filter could be clogged over time.
When you first turn the key in the ignition switch. Listen for the fuel pump in the tank should be turning on. You may have to get under the car and listen to the fuel pump coming on when some one else turns the key. The fuel pump should turn on a few seconds before trying to start. IF the fuel pump is coming on. The fuel pump itself is not holding the pressure anymore after sitting a while.
I would take to a local shop to check it out if the fuel filter does not work.

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