Question about 1993 GMC Sierra

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Fuel injectors New Fuel pump and Fuel in Tank, but engine will not start. Believe gas is not reaching the Fuel Injectors.

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  • GMC Master
  • 586 Answers

Start with a fuel system pressure test.

Posted on Jun 05, 2014

6 Suggested Answers

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Posted on Jan 02, 2017

jagjeffery
  • 316 Answers

SOURCE: throttle body injectors not fiering but there is fuel pressure

the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up

Posted on May 31, 2009

  • 291 Answers

SOURCE: 1991 GMC Sierra loses fuel pressure after it reaches the TBI

THE INJECTORS ARE PULSED TO GROUND DIRECTLY BY THE ECM...... MAIN COMPUTER... IT COULD BE FLAKY BUT I HAVE FOUND MANY TIMES THAT THE HALL EFFECT SENSOR LOCATED IN THE TOP OF THE DISTRIBITOR GETS INTERMITTANT.... THIS CAUSES LOSS OF SIGNAL TO ECM INTURN LOSS OF SIGNAL OUT OF ECM TO INJECTORS... LET ME KNOW

Posted on Sep 01, 2009

co7196
  • 3433 Answers

SOURCE: 1995 gmc safari, just changed fuel

Try this. Check the fuel inertia switch. Should be locatedi n the rear in a pane, fuel tank side and not far from the fuel tank. If you have an owners manual, it's instructions are in there.l. Pull to reset. Good luck -Ned-

Posted on Sep 19, 2009

airjer995
  • 5332 Answers

SOURCE: 97 jimmy runs when you

If the 8th letter of the VIN # is W which i bet it is than your fuel pressure is to low.

This engine uses a CPI unit to deliver fuel to the cylinders. The CPI unit consists of a central injector that feeds fuel to the poppet valve that are right above the intake valves. The poppet valves require high fuel pressure in order to open and deliver fuel to the cylinders at start up.

The reason why it starts and runs if you add a little gas through the throttle body is that once the vehicle is running the intake is under vacuum. The poppets can open with less fuel pressure in a vacuum. This is a real common scenario with these style injection systems.

A new good quality fuel pump (a/c delco or delphi are good pumps) and your fuel pressure should be back into spec of 58 psi or more and the vehicle should fire right up. Make sure you replace the fuel filter when you replace the pump.

Posted on Oct 17, 2010

jturcotte
  • 7772 Answers

SOURCE: my 1993 GMC Sierra Z71

Hi, that's possible but first check the ECM fuse and use a test light to check for power to the injectors on the red and white wires. The computer uses a number of sensor inputs to calculate the injector signals required. If these signals are not available, the computer cannot send the appropriate injection metering signal and will usually set the engine light. Is the engine light on?

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Posted on Mar 27, 2011

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1 Answer

Fuel not getting to engine


I doubt it is the injectors. It could be the pump, but I would also wonder about the gas tank venting system.
If the injectors were at fault, waiting a few minutes would have no effect. They would still be gunked up or failing. Same thing with the fuel pump.
If the gas tank were building up pressure, it could be very difficult for the fuel pump to work. But then you should be getting a check engine light if the computer can not vent the tank.
Its possible one of the O2 sensors is going bad, but again you should be getting a check engine light.

Jul 01, 2013 | Nissan Altima Cars & Trucks

1 Answer

Will not start


Gas, air, compression, and spark is all the cylinders need for the engine to run. No start is usually gas or spark related. Here's the fuel check on fuel injected cars. Turning the key to on will start the pump for 2 or 3 seconds to pressurize the system. When the engine is cranking over the computer turns on the fuel pump relay again, so the pump will be on. And stays on after engine is running to keep high pressure against the fuel injectors. The computer times the injector pulse to spray gas into the intake or into the cylinder at the right time.
So if you have a no start, to check for gas, listen for the pump- a distinctive hum or buzz from the tank, check the fuel pump fuse, see if you can feel or hear the fuel pump relay click when someone turns the key to on. (Did you remember to check if the tank has gas?). Finally, you would have to check for power on the fuel pump wire at the tank connector, while someone holds the key in start. If you have power there, it's likely you need a new fuel pump. If the pump is working, well and good, but keep in the back of your mind that a weak pump that puts out low pressure can cause hard starting problems and poor running. At any rate, if you have gas up to the fuel rail, the only other thing between there and the cylinders is the injectors. Are they working? A quick check would be to remove a spark plug or two after cranking the engine over a few seconds. If they are wet with gas, the injectors are injecting. Hope I've helped you out some. I know some people who say to spray some starting fluid into the air intake to check if you have a gas problem with starting- I've done it myself. But I've learned it's better to use carburetor cleaner spray instead, it burns cleaner and something about the potentially harmful effects of starting fluid, well. good luck.

May 14, 2013 | Plymouth Voyager Cars & Trucks

2 Answers

Engine surges like it going to stall, then starts racing.


Check your 02 sensor, this could cause those symptoms, let me know if this helped, thanks mike from fixya.

Jun 11, 2011 | Saturn SL1 Cars & Trucks

2 Answers

I hav a 95 maxima and my bro drove it till it ran out of gas.Ever since then the engine light has come on and it takes alot for it to turn over when starting. Sometimes the battery dies before itll start.I...


Replace your fuel pump. When you run a vehicle completely out of fuel, you will pull all the sediment off the bottom of the tank, and this will indeed clog fuel injectors, but first it will clog your fuel filter. After replacing your fuel filter, purchase a high-octane fuel injector cleaner, and add it to your fuel tank as specified on the side of the fuel injector cleaner bottle specifies.

Nov 15, 2010 | 1995 Nissan Maxima

1 Answer

I dropped the fuel tank to drain old gas.I put new gas in and turned engine to start it didnt start. Should I be able to hear fuel pump if it is working?This is for a 1990 ford e-150 van.Also where the is...


Turn the key to the ON position without starting the engine. You should hear the fuel pump running for 5 seconds if working. This primes the gas to the injectors when doing this. If not heard running check the oil pressure switch for the 12 volts needed to run the fuel pump starts there on that harness. When the engine starts and the oil pressure reaches the normal pressure the computer shuts off that circuit and turns on the fuel pump relay to run the pump. The relay stays on till you shut the engine off

May 08, 2010 | 1990 Ford Econoline

1 Answer

Mazda 2002 tribute just wont start was running good put new gas cap in whats my problem please


Hello there :
I would say the most common problem is a clogged fuel filter. Make sure you follow your manufacturers recommendations as to when you should change the fuel filter. This information should be in your owners manual. Symptoms include sputtering at high speeds or engine not starting at all. Always check the ignition system first, if that's ok then the next suspect is the fuel filter.
Next most common problem is the fuel pump failing. Most modern electric fuel pumps can be heard when you turn the key on. If you don't hear the pump running and your car will not start, it could be your fuel pump. The first thing a mechanic will check is the relay which sends power to the pump. If this is operating correctly then the pump will have to be replaced.
Last but not least is dirty injectors. While the fuel filter does a good job of filtering the fuel, it's not perfect. Over time deposits and tiny particles lodge themselves in the injectors. This can clog and injector and prevent it from delivering the fuel the engine needs. It can also cause an injector to stick open and send too much fuel into the engine. A regular addition of fuel system cleaner like STP Injector Cleaner, or Techtron fuel system cleaner can help keep your injectors clean. Most gas stations, department stores and all automotive parts stores will have a good cleaner available. Add it to your empty tank right before you fill up and it will clean as you drive. I recommend doing this every 3 months to keep your injectors performing like new. Mechanics also offer a cleaning service where they actually disconnect the fuel line and flush cleaner through the engine. This is only necessary when you let your injectors get to a point where they can not be cleaned by a store-bought product. Regular use of a good in-tank cleaner will keep you from having to pay for this service. Where do you buy your gas?
Believe it, or not, it can make a difference. Always buy from a well know national brand service station. Gas stations which are not affiliated with one brand of gas tend to get whatever is left at the end of the day from the delivery truck. One day them might get Texaco, and Exxon another. Also water mixed with gas will cause problems with your engine. The engine will not run right, plus the water will promote rust in the fuel system. I have experienced this when I purchased gas at some no-name gas stations. Your car will feel sluggish and sometimes refuse to run if there is enough water in the gas.
Octane rating tip !!!!
Putting super in the tank will not get you any more performance or gas mileage unless specifically recommended by your cars manufacturer. If your owners manual says put in 87 octane...... DO IT. You are throwing money out the window if you are filling up on Super or Premium and you only need Regular.
Hope this is very helpful for you '
Best regards Michael


Dec 30, 2009 | Mazda Tribute Cars & Trucks

1 Answer

I removed the injector and fuel regulator assembly from the motor all in one piece, and left the electrical lines attatched in an attempt to see if the injectors were working. I attempted to start the van...


Yes, if everything is still connected properly, except that the injectors are no longer seated int he valve head, then you should see little spurts of gas coming from them when the engine turns over.

Be aware though, that it might not be your fuel injectors that are the problem. You need to finish checking the rest of the car before making that assumption.

Once you know the injectors aren't firing, you need to check the fuel filter and the fuel pump to make sure the gas is getting from the tank to the injectors.

You should have a fuel filter located on the passenger side of your car near the gas tank. Follow the gas lines under the car to find it. It is good to change it anyways, but you can check to see if gas is coming from the tank to the filter by removing the rear line

** BE CAREFUL, Gasoline is EXTREMELY irritating to the eyes and skin, and it WILL come out when you remove the line from the filter***

If it is coming from the tank to the filter you don't have to check your pump. Then replace the rear gas line, and remove the front gas line going to the engine and make sure the filter spits out gas while the engine turns over as well.

If there is no gas getting to the fuel filter, you will need to check your fuel pump, which should be located inside the gas tank. You can check it by getting under the car while you have a friend turn the key to the "on" position, but not starting the car. Do this 4 to 6 times to make sure you hear a little "Click, woosh" type sound that lets you know the pump is triggering.

If you have gas coming from the tank, through the filter and it is still not coming through the injectors, then you will need to rebuild your fuel injectors.

This is not hard to do, and consists mostly of changing the little gaskets in the injectors. But be aware that there are lots of small parts and the job cannot be rushed. Also be aware that lumina fuel injection systems are very sensitive. Make sure to disconnect your battery cables before removing the injectors from the system.

Nov 10, 2009 | 1994 Chevrolet Lumina APV

3 Answers

Ichanged motor in this car and it willnot start, I put gas in the throttlebody and it will run and cutoff. What seems to be the problem?


MAKE SURE FUEL TANK NOT EMPTY.LISTEN FOR FUEL PUMP OPERATION WHEN YOU TURN ON IGNITION KEY.IF NOT CHECK FUSE AND RELAY.IF FUEL PUMP RUNNING CHECK FUEL INJECTORS FUSES IF ALL IS WELL..SCAN IT TO CHECK FOR PCM PROBLEMS OR INJECTORS PROBLEMS.

Aug 03, 2009 | Saturn L-Series Cars & Trucks

2 Answers

Sugar in Fuel


The only thing i can tell you is to get all the gas you can out of the tank, even if it means droping the tank. Then blow out the fuel line, install new filter, fill up with new gas with a fuel additive that cleans injectors and run it. I believe the worst that can happen is clog up the injectors, witch may not happen if you just run it. Depending on how much sugar was put in it.

May 26, 2009 | 1999 Jaguar XJ

2 Answers

Help w 1994 chevrolet truck


This injector set-up needs a specific fuel pressure supplied to the fuel rail to even start, much less run properly. The fuel pump is immersed in fuel inside the gas tank to keep it cool and not burn up. Running the fuel level low causes more heat in the pump and interuptions in proper fuel pressure. AC/Delco pumps have proven to be a reliable fix, the aftermarket pumps only last for a month or two sometimes. Check fuel pressure under the hood and power and ground to fuel pump at electrical harness at top of gas tank. This truck needs a fuel pump.

Aug 18, 2008 | 1994 Chevrolet C1500

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