1994 GMC Safari My van wont start

Tiny
EBABE19
  • 1994 GMC SAFARI

1994 GMC Safari

I started my van about 2 weeks ago and it started just fine. I relized I had forgot something inside so I shut the van off and went inside to get it. When I came out I try to start it again and it would not start over. It cranks over it just will not start. My husband has put on a new fuel pump, a new fuel filter, 2 new relay switches, a new brain and he has checked the fusible wires and they are look good. Would any one know maybe why my van wont start? We would really appreciate all the help we can get. We have tryed everything.

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Tuesday, May 18th, 2010 AT 10:21 PM

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Tiny
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Need to test fuel pressure to see if its getting fuel, also check for healthy spark at each plug. If OK check compression of cylinders

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Tuesday, May 18th, 2010 AT 10:24 PM
Tiny
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He has checked the fuel and compression in the cylinders and he says that is fine, however one of sparks from the plugs is really big. He says its got a small hole in it, but he says it has been like that since we got the van.

Thank you for getting back with us.

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Tuesday, May 18th, 2010 AT 10:34 PM
Tiny
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Sorry i'm not sure what you're talking about when you say it has a small hole in it? What has a hole in it?

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Tuesday, May 18th, 2010 AT 10:39 PM
Tiny
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The spark plug wire has a hole in it. The spark goes from the spark plug wire to the motor.

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Tuesday, May 18th, 2010 AT 10:54 PM
Tiny
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Oh OK, one bad plug wire would not stop engine from starting. may need to scan vehicle's computer for any stored trouble codes. if it's getting fuel spark and good compression then must have electrical trouble somewhere. read over our article on this common problem at http://www.2carpros.com/first_things/car_cranks_but_wont_start.htm

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Tuesday, May 18th, 2010 AT 11:02 PM
Tiny
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The fuel pump is not pumping, sorry if I got confused. The brain reads that everything is ok.

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Tuesday, May 18th, 2010 AT 11:06 PM
Tiny
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Oh sorry about that.

If the fuel pump is not getting power but the fuel pump, fuel pump relay and fuses are good then it leads to either bad wiring at the fuel pump or a faulty fuel pump/ oil pressure switch. My bet would be on the switch, your vehicle's fuel pump switch is on the top rear of the engine.

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Tuesday, May 18th, 2010 AT 11:10 PM
Tiny
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Thank you. He is going out now to see if he can find the switch. Would there happen to be a diagram or somthing he could look at if he cannot find it? Thank you again for helping we really appreciate it a lot!

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Tuesday, May 18th, 2010 AT 11:14 PM
Tiny
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Sure, there are two different versions so just match up your safari's 8th digit in the VIN to one of the diagrams below. the first diagram is for 8th digit VIN "W" while the second is for 8th digit VIN "Z"..


http://www.2carpros.com/forum/automotive_pictures/261618_Noname_2191.jpg




http://www.2carpros.com/forum/automotive_pictures/261618_Noname2_711.jpg

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Tuesday, May 18th, 2010 AT 11:23 PM
Tiny
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He is out there looking for it and he says he cant find it. I dont know if he is over looking it or what. I dont think he is sure what it looks like, but we see nothing that could be any type of switch.

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Tuesday, May 18th, 2010 AT 11:35 PM
Tiny
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Will be mounted into engine block and look similar to pic below.. it is called oil pressure switch but the fuel pump runs through the circuit as well


http://www.2carpros.com/forum/automotive_pictures/261618_Noname_2193.jpg

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Tuesday, May 18th, 2010 AT 11:40 PM
Tiny
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Ok thank you so much! So I guess that means we need to buy a new one and replace the old one?

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Tuesday, May 18th, 2010 AT 11:47 PM
Tiny
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Yes I believe the switch will be $15 to $20 at most local auto part stores.

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Tuesday, May 18th, 2010 AT 11:53 PM
Tiny
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Thank you so much for your help we really appreciate it. We are going to go buy one tomorrow and hopefully that will fix it. Thanks! But would you now why the brain reader didnt read that is was not working?

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Tuesday, May 18th, 2010 AT 11:58 PM
Tiny
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Computer can not recognize a failed oil pressure switch if the oil pressure is still reading good. The oil pressure switch itself may be good, but the internal wiring that is part of the fuel pump circuit may have failed which means no juice to fuel pump, but a fully function oil pressure gauge or warning lamp.

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Wednesday, May 19th, 2010 AT 12:01 AM
Tiny
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Ok, thank you so much for your help. We really appreciate it!

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Wednesday, May 19th, 2010 AT 12:08 AM
Tiny
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Well that did not help. We do know it is a fuel problem. It is not getting fuel but we do not know why.

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Wednesday, May 19th, 2010 AT 1:56 PM
Tiny
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You say fuel pump is not pumping now you say its not getting fuel but don't know why. So is pump working or not?

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Wednesday, May 19th, 2010 AT 2:02 PM
Tiny
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Yes the pump is brand new and it does work. It also has a new fuel filter on it, a new brain, a new oil pressure switch, and new relay switches. My husband put gas in the carborator and it starts that way, but it will not stay running because the fuel is not comming through the van like it should. If the pump is good and working would you maby know why its not allowing the gas to come through? The wiring harnest maybe or maybe clogged fule lines?

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Wednesday, May 19th, 2010 AT 4:26 PM
Tiny
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Could be bad fuel injectors, you should be able to hear the injectors clicking open and close. Usually holding a broom stick up to each injector will let you hear it much better. Really need to check the fuel pressure, if it is low but the fuel pump is working then there is most likely a clogged fuel delivery line or bad pressure regulator. If the pressure is not low then most likely injectors are not working.

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Wednesday, May 19th, 2010 AT 4:33 PM

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