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Old May 23, 2013 | 09:22 PM
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Fuel Pressure?
My 1975 300 6cyl has a slight stumble and I thought I'd check the fuel pressure. I installed a new gauge just before the carb as directed. It reads just over 4 lbs, and also it fluctuates a little with the engine idling. Does this sound right?
 
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Old May 23, 2013 | 09:31 PM
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4-6 psi is spec for that engine
 
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Old May 23, 2013 | 09:58 PM
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The fuel pump is fine; check the accelerator pump.
 
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Old May 23, 2013 | 11:55 PM
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OK. I'll do that.
Thanks
 
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Old May 24, 2013 | 08:52 AM
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By the way, it's a Carter YF (1b). What should I be looking for with the acc pump?
 
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Old May 24, 2013 | 09:07 AM
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If you look down the throat ( engine off ) and manually work the throttle you should see the pump squirt fuel . Ck that the base is tight also . Carter carbs have a habit of working loose with time .
 
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Old May 24, 2013 | 09:16 AM
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Just so I understand what I'm up to here, how is the check to see if the pump is squirting fuel when I work the throttle related to my problem of stumbling when at idle?
 
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Old May 24, 2013 | 09:45 AM
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Originally Posted by Old Coyote
Just so I understand what I'm up to here, how is the check to see if the pump is squirting fuel when I work the throttle related to my problem of stumbling when at idle?
Acelerator pump will not cause a stumble at idle . But will at throttle tip in . By stumble , do you mean miss ?
 
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Old May 24, 2013 | 10:08 AM
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Yes, like a slight miss. I'm wondering if I have a vacuum leak.
 
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Old May 24, 2013 | 10:26 AM
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I would start with the basics , timing , tune up condition ( plugs wires cap ect ) Yes ck for vac leaks . A compression test for good measure . Oh , and ck that the carb is not lose , that would be a vac leak . the carters loosen up in the middle to base area and will cause issues .
 
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Old May 24, 2013 | 10:36 AM
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I've checked the timing and I replaced the cap, rotor, wires, plugs a while back when I bought the vehicle. But I will check for vac leaks, including the carb base.
Thanks
 
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Old May 25, 2013 | 09:35 AM
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To wrap up the thread, it was indeed a vac leak at the carb base. She's running so much better now. Thanks fellas.
 
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Old May 25, 2013 | 09:39 AM
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Glad you got it fixed , thanks for posting your fix !
 
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