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1983 GMC S15 Where's the fuel pump?

Tiny
OTTERGUY
  • MEMBER
  • 1983 GMC S15
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
This is a S15 Jimmy. My son was told it didn't pass smog test because it was leaking from around the fuel pump. I took a look assuming mechanical fuel pump on engine block but I cant find it. Is it in the fuel tank? And if so how would that affect the smog test results?
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Monday, January 4th, 2010 AT 4:49 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Due to excessive fuel pressure-could be the fuel pressure regulator and a clogged return line-This problem will raise the hydrocarbons -unburned fuel.
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Monday, January 4th, 2010 AT 4:55 PM
Tiny
OTTERGUY
  • MEMBER
  • 2 POSTS
Razmataz-
That makes sense to me. Would the fuel pressure regulator be up by the carburetor (yes this baby is pre fuel injection) or on the fuel pump?
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Monday, January 4th, 2010 AT 5:41 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
My Q here is it a TBI or a Vortec system-if its a TBI its within the injectors on top, now for Vortec its under the upper plenum-
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Monday, January 4th, 2010 AT 5:49 PM

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