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Old 05-23-2021, 10:59 AM   #1
Veeder
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Default Carburator or Fuel Pump stock V8 Flathead

Probably an easy question for a few of you folks. Car runs great until you put the pedal to the floor accelerating and the engine just bogs down almost stalling back off on the pedal picks up like nothing ever happened. Could it be the linkage setting on the side of the carburator? Or should I go after the fuel pump?

Thks in advance
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Old 05-23-2021, 11:33 AM   #2
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Default Re: Carburator or Fuel Pump stock V8 Flathead

Rebuild the accelerator pump. It probably needs a new seal. To check fuel flow, disconnect the coil wire and the fuel line from the fuel pump to the carb (AT THE CARB) and crank over the engine . If fuel flows out, your pump is good. Be sure to catch the fuel in a container and not let it splash on your engine. Safest to do when your engine is cold in case fuel contacts hot exhaust manifolds.

Last edited by 19Fordy; 05-23-2021 at 11:40 AM.
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Old 05-23-2021, 04:33 PM   #3
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Default Re: Carburator or Fuel Pump stock V8 Flathead

Could be coil or condenser Dave
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Old 05-23-2021, 06:45 PM   #4
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Default Re: Carburator or Fuel Pump stock V8 Flathead

1) If it was the fuel pump not putting out enough, it will accelerate fine when you floor it, and then stumble as the float bowl gets low. Does not sound like your symptom. But check the pump as 19Fordy said. Each cycle of the pump should squirt out about a tablespoon.
2) If the accelerator pump is not pumping, it will stumble when you floor it, and them pick up. Again, doesn't sound like your symptom. But check. Idle the engine for a minute to be sure carb has fuel in the bowl. Engine off; look down the throat of the carb and quickly fully open the throttle. Should see a squirt/stream of fuel in each barrel. No, - rebuild accelerator pump.
3) A failed power valve might give weak acceleration, but should not almost stall the engine. But what carb do you have?
4) A weak spark can fail as rpm and combustion pressure go up. Could be coil, condenser, points adjustment or plug gaps. Check a spark plug wire while cranking. It should jump half an inch with a blue spark. Shorter jump or yellow spark suggests checking the ignition. Check it again while idling.
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Old 05-23-2021, 08:27 PM   #5
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Default Re: Carburator or Fuel Pump stock V8 Flathead

Thks guys I'll work on it a bit tomorrow
It is a 2 port stock carburator I believe it's a a Stromberg. I did rebuild this last year and this is a new issue however I also have a different distributor on the car. Which I can easily try. I've been meaning to get anot her carburator to carry as a spare so I'll start looking for one I can rebuild.
Before I swap the distributor I'll take a few more rides to be positive on my description of the issue. I'm really wondering if the distributor is the issue.

I'll very fuel pump operation as well

Should be able to work on this tomorrow after I help my neighbor.
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Old 05-23-2021, 09:10 PM   #6
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Default Re: Carburator or Fuel Pump stock V8 Flathead

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Generally the carburetor has a 3 position adjustment for the accelerator pump stroke.
If not already in the position that provides the longest stroke, adjust it so that it is.
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Old 05-23-2021, 11:14 PM   #7
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Default Re: Carburator or Fuel Pump stock V8 Flathead

Next time you do that, pull the choke and see if it helps till it picks up.
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Old 05-24-2021, 06:23 AM   #8
Terry,OH
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Default Re: Carburator or Fuel Pump stock V8 Flathead

The linkage setting on the side of the Carb. is a seasonal adjustment giving a slightly richer adjustment by increasing accelerator pump stroke. #1 is hot weather, #2 is moderate temperature and #3 is winter.
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Old 05-26-2021, 04:21 PM   #9
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Default Re: Carburator or Fuel Pump stock V8 Flathead

My suggestion is to swap out the carb with the other one you have. That way you’ll know if your original thought of replacing the fuel pump is warranted.
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Old 06-08-2021, 09:22 AM   #10
Veeder
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Default Re: Carburator or Fuel Pump stock V8 Flathead

Guys had the car out finally still no verdict I think I'm going to swap the coil for starters
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Old 06-08-2021, 09:45 AM   #11
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Default Re: Carburator or Fuel Pump stock V8 Flathead

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Originally Posted by Veeder View Post
Guys had the car out finally still no verdict I think I'm going to swap the coil for starters
From the symptoms you'd described, this is not a coil issue.
I'd replace the accelerator pump.
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Old 06-08-2021, 10:45 AM   #12
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Default Re: Carburator or Fuel Pump stock V8 Flathead

An accelerator pump is only for when the engine transitions from low to high power. It gives a small shot of gas until the carb can deal with the added flow. A bad pump will not effect the engine after a second or two.
If you can back off and the engine immediately clears up, it is not low fuel supply.
It is usually plugs, coil or voltage to the coil.

Last edited by Andy; 08-09-2021 at 10:15 AM.
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Old 08-08-2021, 02:13 PM   #13
Veeder
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Default Re: Carburator or Fuel Pump stock V8 Flathead

Update
Discovered car runs great until going up a long hill I now sucpect carb float adjustment or since I keep the tank full all the time could the fuel be blocking the fill thus the tank not venting?
Also anyone ever measured how much fuel comes out of the carburator when you remove one of the two brass screws in the base of the bowl.

I'm going out to get this to screw up on a long hill and then just throw some gas directly into the carb and it should start right up.
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Old 08-08-2021, 02:51 PM   #14
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Default Re: Carburator or Fuel Pump stock V8 Flathead

By the way the accelerator pump is working fine does approx. 20 cycles before it empties the carburator bowl
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Old 08-08-2021, 02:56 PM   #15
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Default Re: Carburator or Fuel Pump stock V8 Flathead

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An excellorator pump is only for when the engine transitions from low to high power. It gives a small shot of gas until the carb can deal with the added flow. A bad pump will not effect the engine after a second or two.
If you can back off and the engine immediately clears up, it is not low fuel supply.
It is usually plugs, coil or voltage to the coil.
Mine does the same, thing when going up hill (coming from Denver back to the house, I climb 3000 ft in 13 miles). The pedal is almost to the floor most of the way. When the car starts to loose power, I turn on the electric fuel pump, and the car picks right back up. The mechanical pump won't keep up with heavy acceleration.
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Old 08-08-2021, 04:12 PM   #16
Veeder
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Default Re: Carburator or Fuel Pump stock V8 Flathead

This is very helpful I may put a new gas tank in this winter so I guess I could buy one prepped for a fuel pump - lots of time to think about this. I just went out could I reproduce +the issue heck know
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Old 08-08-2021, 04:15 PM   #17
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Default Re: Carburator or Fuel Pump stock V8 Flathead

If this is a Holley/Ford 94 type carburetor, also check to make sure the accelerator pump link hasn't disconnected itself from the throttle lever. Fairly common with a lot of use and wear.

Never mind to the above, I just saw that the accel pump was working well.

Sal
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Old 08-08-2021, 04:50 PM   #18
Merc Cruzer
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Default Re: Carburator or Fuel Pump stock V8 Flathead

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Originally Posted by Veeder View Post
This is very helpful I may put a new gas tank in this winter so I guess I could buy one prepped for a fuel pump - lots of time to think about this. I just went out could I reproduce +the issue heck know
The electric fuel pump just goes in the line. Mine is mounted on the frame as close to the tank as possible. No special tank required.
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Old 08-08-2021, 05:15 PM   #19
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Default Re: Carburator or Fuel Pump stock V8 Flathead

What kind of distributor are you running? You mention you changed it recently. Does it have vacuum advance? If so your vacuum advance canister could be bad or the advance springs need adjustment.

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Old 08-08-2021, 05:35 PM   #20
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Default Re: Carburator or Fuel Pump stock V8 Flathead

Merc Is this pump 6 volts was looking in their website for it
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