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No gas getting to carb.

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by GCRIV, Jul 15, 2008.

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  1. Nov 30, 2008 #21
    Shelby~gt350#3000

    Shelby~gt350#3000 Well-Known Member

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    Re: No gas to carb. Checked fuel pump

    OK it makes sense now. You did everything correct. So now you know it will be the pump or the eccentric. I would try another pump from the store. It's the easiest thing to do.

    Jim

    Good luck!

    Jim
     
    Last edited by a moderator: Dec 1, 2009
    Shelby~gt350#3000, Nov 30, 2008
    Shelby~gt350#3000, Nov 30, 2008
    #21
  2. Nov 30, 2008 #22
    OVERRIDE

    OVERRIDE Well-Known Member

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    Re: No gas to carb. Checked fuel pump

    The line that runs from tank to fuel pump remove line. Run a hose from a gas can to intake side of fuel pump. If it is a 65 pump pull fuel canster off and fill it wit fuel to help prime the pump. If you have no fuel to fuel pump did you blow air through the steel line from tank to pump with line off you should have a good flow of air .
     
    OVERRIDE, Nov 30, 2008
    OVERRIDE, Nov 30, 2008
    #22
  3. Nov 30, 2008 #23
    s2ms

    s2ms Well-Known Member

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    Re: No gas to carb. Checked fuel pump

    The same thing happened to me years ago when I switched a car I had purchased from an electric pump back to a stock pump. I forgot the eccentric locating pin that fits in the cam face and just tightened the eccentric. The car ran fine for a while but eventually the pressure of the pump arm loosened the eccentric.

    With the pump off you may be able to stick a long screw driver or something into the timing cover opening and see if the eccentric is secure or not. A friend holding a flashlight and mirror will help.
     
    s2ms, Nov 30, 2008
    s2ms, Nov 30, 2008
    #23
  4. Nov 30, 2008 #24
    GCRIV

    GCRIV Well-Known Member

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    Re: No gas to carb. Checked fuel pump

    Well, I guess it would be the eccentric. I just purchased a new pump from the store, and discovered it worked, or should I say did not work just as good as my old one did. I sure wish I knew that before I dropped $45 on that sucker. Well, since I have no shop, and daylight is hard to come by after 5:00, I'll crack this thing open next weekend and see what is going on inside. Thanks for all the hints and suggestions.
     
    GCRIV, Nov 30, 2008
    GCRIV, Nov 30, 2008
    #24
  5. Dec 1, 2008 #25
    Shelby~gt350#3000

    Shelby~gt350#3000 Well-Known Member

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    Re: No gas to carb. Checked fuel pump

    The store charged you another $45.00? I thought you were going to return the pump that you just purchased in exchange for another one?



    Jim
     
    Last edited by a moderator: Dec 1, 2009
    Shelby~gt350#3000, Dec 1, 2008
    Shelby~gt350#3000, Dec 1, 2008
    #25
  6. Dec 1, 2008 #26
    GCRIV

    GCRIV Well-Known Member

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    No, my mistake. I only purchased one pump. But I figure I'd better go ahead and hang on to it. When I manually pumped the arm, it shot out all the fuel that was being held in the cannister. So I'm sure it works, but for that matter I think my old one was working, just the cam eccentric that slipped. Well, I guess I can look at it that I got a brand new pump out of the deal. Too bad I didn't need it!

    I've replaced the fuel pump, had a loose eccentric, tightened that up. I've taken the line loose at the fuel pump, and dunked it into a can of gas. Disconnected it at the carb, and had good fuel flow at the carb. I hooked the line back up, and put the can of gas on the ground back at the fuel tank. I turned the car over again, and STILL have poor gas flow. That tells me I have something clogged in the line somewhere. Unless.....the can of gas is lower than the tank, could the pump be having to work to hard to get the gas uphill thru the line. I just don't know if the blockage is in the line, or in the tank. I'd like to isolate the problem without pulling the tank if I have to. Does anyone know if sucking the gas from a can on the ground would prevent good flow all the way up to the fuel filter?
     
    Last edited by a moderator: Dec 1, 2009
    GCRIV, Dec 1, 2008
    GCRIV, Dec 1, 2008
    #26
  7. Dec 7, 2008 #27
    patty.dilabio

    patty.dilabio Well-Known Member

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    Re: STILL getting no gas to carb

    Hey to fuel starved! If you have an air compressor,or can borrow one,try blowing from the fuel pump end of the line while the tank end is disconnected.You should have good air flow if it is not blocked or kinked.If you can't move air you will not move liquid.If this proves the line is not flowing,cap the tank end,and fill the line with a strong solvent and let it soak,then uncap and blow air through it again.Keep this up untill you get clean solvent out of the tank end.Remove the fuel sender from the tank,and either replace it,or clean out the pickup tube,and replace the sock filter.Examine the inside of the tank with the sender removed for any contaminates,and clean/replace as necessary.Remember V8 engines will not run on vapor or fumes..they need fuel.And to answer your original question:yes the pump is strong enough to draw from ground level.Hope this helps! Strong solvent like lacquer thinner or spray carb/brake cleaner should soften the tar/varnish that I suspect is inside the line.
    Good luck ! P.D.:thumbup:
     
    patty.dilabio, Dec 7, 2008
    patty.dilabio, Dec 7, 2008
    #27
  8. Dec 7, 2008 #28
    GCRIV

    GCRIV Well-Known Member

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    Re: STILL getting no gas to carb

    Well, now I can't figure out what is going on. I disconnected the line from the line running from the tank, and put it directly in the can of gas. When I did this yesterday, gas came squirting out the line going to the carb. Now, as I watch, no gas is coming from the tank up thru the filter. I just don't understand it. How can the fuel be pumping gas, but not pulling? I have taken the line from the tank out of the equation, how can it not be pulling gas?

    I have taken the line from the tank out of the equation, how can it not be pulling gas?
     
    GCRIV, Dec 7, 2008
    GCRIV, Dec 7, 2008
    #28
  9. Dec 7, 2008 #29
    Snakepit

    Snakepit Well-Known Member

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    Re: STILL getting no gas to carb

    Could the diaphram have a small crack in it or one of the check valves have something in it?

    My guesses
     
    Snakepit, Dec 7, 2008
    Snakepit, Dec 7, 2008
    #29
  10. Dec 7, 2008 #30
    DJR

    DJR Well-Known Member

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    Re: STILL getting no gas to carb

    Filter plugged?
     
    DJR, Dec 7, 2008
    DJR, Dec 7, 2008
    #30
  11. Dec 7, 2008 #31
    jnk-dlr

    jnk-dlr Member

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    Re: STILL getting no gas to carb

    How Much gas is in the tank to start with ???? there is a filter inside the tank on the end of the pick up tube might be clogged ,try blowing back in to the tank from the carb back another thought did you just change the fuel cap ??? is it vented ,also try tunning the cap 1/4 turn loose hope this helps ...:huh:
     
    jnk-dlr, Dec 7, 2008
    jnk-dlr, Dec 7, 2008
    #31
  12. Dec 7, 2008 #32
    GCRIV

    GCRIV Well-Known Member

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    Re: STILL getting no gas to carb

    I'm not familiar with the check valve. Where would it be. I doubt the diaphram is cracked, it's a brand new pump. The fuel filter is also brand new, can't imagine it would be clogged. And I'm not even connected with the tank, I just have the input line submersed in a can of gas. I'm just plum out of ideas?
     
    GCRIV, Dec 7, 2008
    GCRIV, Dec 7, 2008
    #32
  13. Dec 8, 2008 #33
    Doug_GT350

    Doug_GT350 Well-Known Member

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    Re: STILL getting no gas to carb

    What about a cracked line inside the tank that would cause you to be sucking air. That would cause poor flow. Just a thought.
     
    Doug_GT350, Dec 8, 2008
    Doug_GT350, Dec 8, 2008
    #33
  14. Dec 8, 2008 #34
    GCRIV

    GCRIV Well-Known Member

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    Re: STILL getting no gas to carb

    Well, maybe I'm fussing about nothing. How full should my fuel filter be when the car is running? It is about 1/4 to 1/2 full, and I've left it running for about 5-10 mins. I am just afraid this isn't enough fuel flowing through there. I talked to our mechanic at work, and he said not to worry about it. It won't have a full fuel filter, only about 1/2. He said it's almost more of a gravity flow. I am suspicious though, it won't pull the gas out of the can which is lower than the fuel pump. I've talked to others that say it should pull the gas up and out of the can and into the fuel filter, but it won't. What do you think?
     
    GCRIV, Dec 8, 2008
    GCRIV, Dec 8, 2008
    #34
  15. Dec 8, 2008 #35
    steele138

    steele138 Well-Known Member

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    Re: STILL getting no gas to carb

    I've got one of the parts store clear filter on my 72 Bronco and when its running its 1/2 to 3/4 full.Had a 71 Mach 1(it was1978) that the sock in the tank gummed up;took compressed air and blew it off car ran like a top.Sounds like you are covering your bases.
    Good Luck,
    Scott
     
    steele138, Dec 8, 2008
    steele138, Dec 8, 2008
    #35
  16. Dec 13, 2008 #36
    GCRIV

    GCRIV Well-Known Member

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    Fuel pump working or not?

    I just replaced the fuel pump on my 66 289. I'm not getting alot of gas flow thru my fuel filter. I thought everything would be allright, but today I went to the gas station to top off the tank. On the way back, it was starved of gas, and just quit. After I coasted to the side of the road, I tried starting it several times, and it finally got going. I know there may be a blockage problem in the tank, or the line, but I would like to know this. A while ago, I had disconnected the line from the tank, and submersed it into a can of gas. A few people told me it should suck gas out of the can. Well, it never did. Should I check the fuel pump pressure? What should it be? Should it be sucking gas out of a can on the ground? Tomorrow I'm going to siphen off the gas, and examine the sock filter on the tank. Any other ideas?
     
    GCRIV, Dec 13, 2008
    GCRIV, Dec 13, 2008
    #36
  17. Dec 13, 2008 #37
    56ace

    56ace Well-Known Member

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    Re: Fuel pump working or not?

    Make sure the rubber lines on the intake side of the pump are all in good shape. If you have cracks you could be sucking air through them and not fuel from the tank.
    Jay
     
    56ace, Dec 13, 2008
    56ace, Dec 13, 2008
    #37
  18. Dec 14, 2008 #38
    Texas Swede

    Texas Swede Well-Known Member

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    Re: Fuel pump working or not?

    The fuel filter on the sending unit in the tank could be clogged.
    It was on my 65 C-code. Took it out and cleaned it and it worked.
    Texas Swede
     
    Texas Swede, Dec 14, 2008
    Texas Swede, Dec 14, 2008
    #38
  19. Dec 14, 2008 #39
    tommyleea

    tommyleea Well-Known Member

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    Re: Fuel pump working or not?

    A while ago, I had disconnected the line from the tank, and submersed it into a can of gas. A few people told me it should suck gas out of the can. Well, it never did. Should I check the fuel pump pressure? What should it be? Should it be sucking gas out of a can on the ground? Tomorrow I'm going to siphen off the gas, and examine the sock filter on the tank. Any other ideas?[/QUOTE]

    If you submerse your fuel line from the pump into a can of gas it will suck that gas out of the can, and run just fine. A mechanical fuel pump is not normally intermittent. It either works or it doesn't. Sounds like your problem comes and goes. If the problem is in the tank, then using the extra can should eliminate the problem. If not then you have other issues; pump, filter, carb. Fuel pressure isn't very high, maybe 4 to 7 pounds, but you need to check the book to verify this. Cheers.

    TommyJ
     
    tommyleea, Dec 14, 2008
    tommyleea, Dec 14, 2008
    #39
  20. Dec 14, 2008 #40
    GCRIV

    GCRIV Well-Known Member

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    Well it's not sucking gas out of the can. Any ideas?

    Is there a filter at the carb? That's about the only place I haven't checked. It is an aftermarket Carter Carb. When I looked, it looks like there may be a filter at the carb gas inlet. I can't really tell, and the wind is gusting 40-50 mph here today, so I don't really want to open up the fuel system with so much dust in the air.
     
    Last edited by a moderator: May 19, 2009
    GCRIV, Dec 14, 2008
    GCRIV, Dec 14, 2008
    #40
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