Fuel Fuel Filter Bone Dry

Discussion in 'Fox 5.0 Mustang Tech' started by 85foxman, Sep 19, 2013.


  1. 85foxman

    85foxman Member

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    Ok guys, I'm stumped...my car seems to run on air...my car runs 5.5-6.5 psi for fuel pressure between mechanical pump and Carb but the fuel filter before the fuel pump is dry. My car starts kinda hard after driving and sometimes stalls while coming to a stop...any ideas? I'm running a 306 E cam 1405 edelbrock Carb with a summit racing mechanical pump.
     
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  2. 85rkyboby

    85rkyboby Active Member

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    You should put the fuel filter between the pump and carb. Those pumps are meant to pull, with the filter before it strains the pump.
     
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  3. 85foxman

    85foxman Member

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    I had the filter between the pump and carb and it did the same thing...I even dropped the tank to check the pickup filter and that was clean so now I'm stumped on why the filter is dry.
     
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  4. 85rkyboby

    85rkyboby Active Member

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    Do you have a return line on yours?
     
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  5. 85foxman

    85foxman Member

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    There is but its not hooked up under the hood...its clear because I blew through it when I had the tank out
     
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  6. 85rkyboby

    85rkyboby Active Member

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    Is this while the engine is cold or hot, could be the choke? Did you adjust the carb or what? Is the fuel filter new or old? Have you looked for vacuum leaks by any chance?
     
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  7. 85foxman

    85foxman Member

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    Its usually when its warm when it starts hard and stalls.
     
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  8. 85rkyboby

    85rkyboby Active Member

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    electric or manual choke? Did you adjust the choke at all? Is the fuel filters new? Have you checked for vacuum leaks?
     
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  9. 85foxman

    85foxman Member

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    Its a manual choke...no vacuum leaks...filter has 1500 miles on it...the choke isn't hooked up.
     
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  10. 85rkyboby

    85rkyboby Active Member

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    what brand carb bro?
     
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  11. 85rkyboby

    85rkyboby Active Member

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    Nevermind lol.

    Sorry its late. What firing order are using for that cam?
     
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  12. 85rkyboby

    85rkyboby Active Member

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    any other mods besides that cam? I have the same carb and they tune easy but I don't care for them performance wise unless on a stock motor. What pump are you running? You said the return is not hooked up under the hood. Do you have the return port capped off? Just trying to see how its not hooked up. Thanks, hang in there.
     
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  13. 85foxman

    85foxman Member

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    I'm using the HO firing order...headers...chrome summit racing high volume mechanical fuel pump...the return line is open under the hood and hooked up on the tank...thanks for your help
     
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  14. 85rkyboby

    85rkyboby Active Member

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    Have you tried using the regular firing order or even the 351? Some cams require the 351 order on 302, not likely but something to check into. Have you ran it with the return hooked up? Only other thing I can think of is bad pump... well back to the carb what are you idling at?
     
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  15. 85rkyboby

    85rkyboby Active Member

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    No problem. I'm still new to the game of carbs and mustang for that matter but I have tackled what seems to be a ton of problems haha. I'm always adding new parts that seem to bring a world of trouble with them.
     
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  16. 85foxman

    85foxman Member

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    Like I said the engine runs fine other then the dying sometimes at stop signs and it starts kinda hard once in a while...it idles at 1000rpms
     
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  17. 85rkyboby

    85rkyboby Active Member

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    Hmmm. Its idling kind of high you could try backing it down but other than that I'm stumped. Maybe somebody will chime in to help in the AM. I'll ask a couple buddies of mine tomm., well in the morning.
     
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  18. 85foxman

    85foxman Member

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    I've been battling this for 4 months now...its like its vapor locking but it doesn't effect running...I don't know if this matters but the car has 5/16 fuel line and my pump is 3/8
     
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  19. 85rkyboby

    85rkyboby Active Member

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    If its vapor lock fix that return line. I still have mine hooked up. Na, I'm running the same stock lines and carb. only difference is our pump.
     
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  20. 85foxman

    85foxman Member

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    Fix what with the return line? I have no place to hook it to under the hood...if I plug it nothing changes...sorry for seeming difficult...thanks for the suggestions
     
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