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74 Buick Apollo

Discussion in 'Small Block Tech' started by Troywilson, Mar 13, 2020.

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  1. Troywilson

    Troywilson New Member

    My Apollo has the 350. It’s my first Buick 350. Had many many sbc but first Buick. It’s all original and stock. It’s the 2 barrel carb. It runs like a dream at idle and when cold. The problem is when it’s warmed up or hot like in traffic it dies and is hard to get started. You have to crank it and pump the gas like a mad man. It acts like it’s out of fuel but it’s not. Then when it goes it misses and barely runs. If it’s cools for a few mins it runs fine but then a few miles down the road it does it all over again. I have heard lots of things. It’s the gas boiling in the carb. It’s the ethanol. It’s the fuel pump. It’s the coil. But rather then throwing money at everything I’m sure someone on here has the problem. Thanks in advance.
     
    Troywilson, Mar 13, 2020
    #1
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    You have to diagnose the problem, otherwise, you guess and throw money and parts at the problem. It sounds like vapor lock, but it could be a weak fuel pump, or it could be the engine is running hot enough to boil the gas out of the carburetor. The ethanol in the gasoline will eventually play havoc with the gaskets and accelerator pump in the carburetor. Consider rebuilding with ethanol resistant parts. The 1974 engine could have points or possibly the big cap GM HEI. Which do you have? Consider rigging up a temporary fuel pressure gauge to check fuel pressure. Having that information when it acts up will tell you a lot. I like starting with the simple things first. Have you tuned it up? Put some gauges on it and see what the coolant temperature is. Also get a manifold vacuum reading fully warm in Park.
     
    LARRY70GS, Mar 13, 2020
    #2
    Darron72Skylark likes this.
  3. stk3171

    stk3171 Well-Known Member

    try it with gas cap loose. if charcoal canister is plugged tank will build vacuum and fuel pump cant pump gas.
     
    stk3171, Mar 13, 2020
    #3
    alec296 likes this.
  4. alec296

    alec296 i need another buick

    I would say tune up, probably plug wires/tune up /gas filter will at least improve things. Weak condenser or coil. When it’s hot , check spark with a screwdriver in a spark plug wire end near a ground. It should easily jump a 1/4 to 1/2 inch gap. What so you don’t get shocked. Do not touch body if you’re holding screwdriver but try to leave it on engine somewhere . If spark is good then it’s fuel. Your sure it’s squirting fuel in carb when it’s acting up? It could be bad/rotten vacuum lines . Maybe choke isn’t pulling off hot. Check plugs for wet or black buildup.
     
    alec296, Mar 13, 2020
    #4
  5. Jim Blackwood

    Jim Blackwood Well-Known Member

    Hand a plug wire to a buddy and ask him to hold it and then turn the key. If it has good spark he will let you know.

    Jim
     
    Jim Blackwood, Mar 15, 2020
    #5
    Mart, Mark Demko, BubbaJ and 1 other person like this.
  6. nekkidhillbilly

    nekkidhillbilly jeffreyrigged youtube channel owner

    sounds like a bad coil
     
    nekkidhillbilly, Jun 4, 2020
    #6
  7. sean Buick 76

    sean Buick 76 Buick Nut

    Could also be boiling the fuel and vapour locking.
     
    sean Buick 76, Jun 5, 2020
    #7
  8. MrSony

    MrSony Well-Known Member

    Try to use ethanol free fuel.You can hear the fuel boiling and feel it if it's the problem.
     
    MrSony, Jun 5, 2020
    #8

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