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Stalls out 45-50 MPH uphill?

Tiny
DONUTOLYMPIAN
  • MEMBER
  • 1976 JEEP CJ7
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 94,000 MILES
Okay, so first let's cover what I've done to the vehicle:

HEI distributor
New mechanical fuel pump
New fuel filter
Weber 38/38 carburetor

So, all that said, it cranks up great, runs great up to 30ish MPH.

Every time I go uphill (sometimes when on level ground) at 45ish MPH the engine starts sputtering and stalling, lunging and slows down.

I've got no idea what to do to fix this, I'm pretty much out of ideas. It's got fire, fuel, and air without issue but uphill it suddenly acts like it doesn't.
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Tuesday, March 28th, 2023 AT 2:28 PM

3 Replies

Tiny
DONUTOLYMPIAN
  • MEMBER
  • 3 POSTS
Not sure why the pics are upside down, they appear right side up on my phone, sorry.
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Wednesday, March 29th, 2023 AT 12:09 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
No problem, I have seen the fuel line going to the tank develop a small hole or crack which allows air to engine the suction side of the pump which allows the fuel delivery to be limited. I would replace this fuel line which should take care of the problem.
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Wednesday, March 29th, 2023 AT 12:16 PM
Tiny
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Awesome, thanks for the response I'll check it out!
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Wednesday, March 29th, 2023 AT 2:01 PM

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