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  •  » Up date on carburetor running out of gas

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    1/30/2022 9:52 PM  #1

    HudginJ3
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    From: Cedar Hill, TX
    Registered: 4/29/2015
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    Up date on carburetor running out of gas

    I did the valve adjustment as suggested, again just to be sure and found no change. I haven't touched it since after that. Last week working on an airplane changing the air filter it came to me. What if the filter isn't big enough?  I ran it with out the filter and it is a lot better. Not perfect. So I thinking I need a bigger filter. The filter I have is for a 302 and a 351. What do the 427,428 and 429's use? I'm not to keen cutting a hole in my hood.

    70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
     

    1/30/2022 10:19 PM  #2

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,253

    Re: Up date on carburetor running out of gas

    Air filter? I doubt size is the problem.
    What is the symptom?

    Aren’t you the one using that tandem electric and manual fuel pump thing?

    Last edited by MS (1/30/2022 10:20 PM)

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    1/31/2022 6:54 AM  #3

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
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    Re: Up date on carburetor running out of gas

    I've yet to see a clean air filter cause a running issue, regardless of size.  Highly doubt that's your issue. 

     

    1/31/2022 7:04 AM  #4

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
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    Re: Up date on carburetor running out of gas

    Steeeeeee-rike  ONE!
    Give us a re-cap of what's going on.........we've slept since you initially posted the issue.
    IF it runs better without the air filter  could mean  the carb is running a little rich.
    6sal6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    1/31/2022 9:01 AM  #5

    HudginJ3
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    From: Cedar Hill, TX
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    Re: Up date on carburetor running out of gas

    I'm running the tandem fuel pumps, when floored the carb runs out of gas at 3500 RPM. I removed the air cleaner and the engine went on up to 5500 RPM.       ???????

    70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
       •Thread Starter
     

    1/31/2022 9:12 AM  #6

    rpm
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    From: Bakersfield, Ca
    Registered: 9/17/2013
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    Re: Up date on carburetor running out of gas

    Have ya checked for full throttle travel with the air cleaner on?. When the motor went to 5,500 rpm was just the filter removed or the entire air cleaner?

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    1/31/2022 10:30 AM  #7

    HudginJ3
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    Re: Up date on carburetor running out of gas

    The entire air cleaner assembly was removed. I have an air cleaner that is open all the way around that was made for the GT cars and the factory air cleaner assembly. It ran just as bad with either one on so I removed the whole thing. I never did check to see if the throttle opened all the way with either one. It never accused to me that might be an issue because it runs strong up to RPM ( revolutions per minute) that it stumbles at.

    70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
       •Thread Starter
     

    1/31/2022 4:06 PM  #8

    6sally6
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    From: Surfside Beach,SC
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    Re: Up date on carburetor running out of gas

    Is the carb/thrott;e linkage hitting the air cleaner.......keeping it from going to wide open position.

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    1/31/2022 4:13 PM  #9

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,253

    Re: Up date on carburetor running out of gas

    First thing I would do is fit it with a cheapo OReilly stock mechanical fuel pump, get rid of the electric pump, and verify the fuel pickup in the tank flows.  There is sero reason to have two pumps on a Mustang. Zero.

    What about your plug wires, was the air cleaner possibly shorting out a plug wire? Or on top of the distributor shorting out?  Or, if an Edelbrock carb, was air cleaner possibly pinching the fuel line where it enters the carb?  What kind of fuel line do you have between the pump and carb? 
    The 70 has rubber fuel lines connecting the two hard lines under the driver door area. Have those been  replaced and the lines cleared?

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    1/31/2022 5:02 PM  #10

    RV6
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    From: Pine Junction, CO
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    Re: Up date on carburetor running out of gas

    Vacuum secondaries open sooner with a filter in place. Is there a chance your secondaries are opening to soon and flogging the engine with to much fuel. Try wiring the secondaries closed and see how it does.
     

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
     

    1/31/2022 5:30 PM  #11

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
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    Re: Up date on carburetor running out of gas

    I would peg this as an interference issue of some kind.  Linkage is hitting the air cleaner and not opening the blades fully, or top of the air cleaner is block bowl vent flow, etc. 

     

    1/31/2022 8:53 PM  #12

    HudginJ3
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    From: Cedar Hill, TX
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    Re: Up date on carburetor running out of gas

    The reason for the electric pum is that it cranks so long to bring fuel to the carb. When it sits for a month the carb is out of fuel. I use it to prime the carb. I used it a couple of times to see if it would over take or help the mechanical pump. It does not. The mechanical pump was new at the bash. It puts out 6 PSI per spec. The fuel line is new along with new rubber hoses. I smashed it several years ago and had the new one in stock. The fuel sending unit is also new. It was original to the car. The filter had fallen apart and I was thinking it was pluging up the pick up tube. It was not. There was no left over residue in the tank. I replaced the fuel filter at the same time. The fuel line is the Ford steel line that screws into the fuel pump and has been reformed at the top to go around to the right side of the carb instead of the original left side. It goes under the carb to the rear banjo fitting via a 2 inch rubber hose that was replaced along with the fuel line.
       The ignition wires are also new 8mm Ford racing wires. Gray not Yellow. The plugs are Motorcraft.
       The carb is a 750 cfm Edelbrock with mechanical secondaries. The air cleaner does not interfear with the linkage by over an inch.

    70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
       •Thread Starter
     

    1/31/2022 9:11 PM  #13

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,253

    Re: Up date on carburetor running out of gas

    Your description sounds like you are happy with what you have, you have thought it through and t should be working fine.

    And you have measured 5-6 psi while it is revving.  Maybe distributor timing/ vacuum issue?  Possibly intake gasket or carb gasket issue?

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

     

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