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Why wont my truck start?

Tiny
SERGIO88
  • MEMBER
  • 1978 CHEVROLET CUSTOM DELUXE
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 35,000 MILES
I bought a rebuilt carburetor from Napa put it on and the truck cranks, but wont start. The fuel pump works the carburetor is getting fuel the vacuum ports are covered. I do not know what is causing the problem.
Tuesday, May 31st, 2016 AT 4:48 PM

6 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
Two teaspoons of fuel down the carburetor throat and cranking does what?

Was it running just prior to the new carburetor?

We have spark or not?

The Medic
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Tuesday, May 31st, 2016 AT 5:50 PM
Tiny
SERGIO88
  • MEMBER
  • 16 POSTS
I did put fuel in the throat. Yes it was running prior to the new carburetor. I do not know if we have spark. I recently changed the spark plugs.
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Tuesday, May 31st, 2016 AT 5:52 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
Did you do them one at a time (hooking the wire back on)

Or did you pull all of the wires off, possibly not putting them back onto the proper spark plug?

Do you know how to check for spark?

The Medic
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Tuesday, May 31st, 2016 AT 5:57 PM
Tiny
SERGIO88
  • MEMBER
  • 16 POSTS
Yes sir one at a time I never take them all off at once. And no sir I do not know how to check for spark.
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Tuesday, May 31st, 2016 AT 6:04 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If it does not start when priming the carburetor with fuel, you have no spark.
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Tuesday, May 31st, 2016 AT 7:22 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hey SERGIO88,

Here is how you check for spark,

https://www.2carpros.com/articles/how-to-test-an-ignition-system

and here is a guide for the not starting issue

https://www.2carpros.com/articles/car-cranks-but-wont-start

Let us know what you find

Best, Ken

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Wednesday, June 1st, 2016 AT 4:38 PM

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