Fuel Filter Empty

Fuel and Air Systems

  1. Paladin06

    Paladin06 Well-Known Member

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    On to my next item to fix on my 1972 Plymouth Duster 340. I've noted that after the car sets for awhile, the fuel filter is completely empty. There are no obvious fuel leaks visible.

    Where should I start.

    Thanks in advance.

    Greg
     
  2. Yote

    Yote Well-Known Member

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    Wish I could help . My '72 340 is the same way. Takes quite a bit of cranking to start.
    Yote
     
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    • Yote

      Yote Well-Known Member

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      Wish I could help . My '72 340 is the same way. Takes quite a bit of cranking to start.
      Yote
       
    • mopar head

      mopar head Well-Known Member

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      New fuel pump.
       
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      • mderoy340

        mderoy340 Well-Known Member

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        Check valve in the fuel pump leaking.
         
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        • Paladin06

          Paladin06 Well-Known Member

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          Thanks guys. Recommendations on a good one.
           
        • sireland67

          sireland67 Well-Known Member

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          Carter sells a muscle car series, for around $30.
           
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          • pishta

            pishta I know I'm right....

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            Does your pump have round body with screws or is it crimped? There are 2-3 rubber flap (outlet valves) pressed in there. One may not be seating. I have found the little rubber pucks dislodged and sitting at the base of the pump.
            fuel_pump_mechanical.gif 88275g01L.gif
             
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            • Abodybomber

              Abodybomber Breaking street machines , since 1983.....:) Legendary Member

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              M6270 ,IIRC....
               
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              • Mattax

                Mattax Just the facts, ma'am FABO Gold Member

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                M6270 was the 'competition' pump and had a cut off pressure of 7.5 psi. In other words, needs a regulator.
                M6902 was the 'Super Street' pump and had a cut off pressure of 6 psi. That's was the better choice for 99% of users.
                Can't speak to the recent reissue of these pumps personally, but have read here of pressure regulation issues.
                If replacing, I'd suggest a stock replacement, or Holley 110 mechanical if there is uncertainty about the cut-off (aka maximum pressure).
                 
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                • Yote

                  Yote Well-Known Member

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                  My fuel pump was new less than 3 years ago and problems stated above have been with me since and car was not operable before that.
                  Yote
                   
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                  • dibbons

                    dibbons Well-Known Member

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                    Is it vapor? When i ran a Holley double pumper it was set up with two transparent fuel filters immediately before the carb inlets. The filters normally looked only half full--until I added an aluminum "cool can" and added ice at the drag strip--the filters thereafter would be completely full (as long as the ice held out, that is). I was using a Holley electric fuel pump with pressure regulator at the time (no mechanical pump).

                    filter.jpg

                    65 Valiant4.jpeg
                     
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                    • Paladin06

                      Paladin06 Well-Known Member

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                      OK, I replaced the fuel pump and BINGO.. Another thing noted is the fact that before the pump change with the car running the filter was never completely full. Now it is completely full. Also the car has set over night and the filter is still full this morning.

                      Thanks @mopar head and all the rest!
                       
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                      • Paladin06

                        Paladin06 Well-Known Member

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                        Ok spoke to soon. Took the car to the about 6 miles round. Car started to run funny. Got home popped the hood and the fuel filter was damn near empty. No fuel leaks but an oil leak around the pump. WTF. Man I can not get a break. Guess I’ll need a new pump, again.
                         
                      • 69FBCuda

                        69FBCuda Life in the Fast Lane

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                        If the fuel pump loses pressure after shutoff and the Float seat in the carb loses the vacuum while setting, the gas flows down hill
                         
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                        • mopar head

                          mopar head Well-Known Member

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                          While your at it, maybe verify their is no fuel restriction or vent problems.
                          Hopefully it`s just a bum pump and you can replace and drive happily ever after
                           
                          Last edited: Jun 4, 2018
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                          • Paladin06

                            Paladin06 Well-Known Member

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                            The new pump was working just fine when I drove the car around the block after I replaced it. The filter was staying full of fuel over night. Today oil leak at the pump and zero fuel in the filter.
                             
                          • RichB

                            RichB CherryCuda65

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                            I have the same hard starting problem with my 65 Barracuda. Are you implying that the stock type fuel pump can be repaired or Rebuilt? I'm tired of trying different fuel pumps and would like to see the problem and then know that it's fixed.
                             
                          • mopar head

                            mopar head Well-Known Member

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                            Oil leak is on you. Make sure your oil does not smell like gas. Re seal, run/drive shut down, remove gas cap and notice if it makes a woosh vacume sound.

                            If you have over a 1/4 tank of gas, jack up the back of the car a little and remove the inlet line to the pump into a tub, with gas cap off, gas should flow. If not, may be time to pull the sender and inspect.
                            As post 15 states, could be the culprit too. What carb. are you running?
                             
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                            • pishta

                              pishta I know I'm right....

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                              If it's the non crimped round one with the Allen bolts holding the upper and lower together, yes, it is repairable. Crimp is a throw away. What carb is this? Carter won't lose fuel unless it's boiling it out, very common without a phenolic/wood/plastic spacer. Neither will a holley but those bowls are more insulated from the intake heat. Both (all) carbs use engine vacuum to pull fuel out the bowls. None have a built in drain 'cept the TQ with bad jet O-rings. I finally went to a carter electric in my 65 cartered 340 as the bowls would be dry every morning. 5 seconds of pumping and the bowls would be full and the car would start under 1 revolution. I'm sure it was heat soak caused as I never had driveability issues.
                               
                            • mopar head

                              mopar head Well-Known Member

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                              Yea, this guy is in AZ hell heat. Don`t know how hot it is there yet. Seems a carb heat spacer would be a must out west.
                               
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                              • RichB

                                RichB CherryCuda65

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                                I have a Carter AFB on an aluminum manifold. Should I try an insulating carb spacer?
                                 
                              • pishta

                                pishta I know I'm right....

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                                Absolutely! Carter on an AL intake is like a pot of water on a grill. You can make one out of MDF or marine plywood or just buy a plastic one. Even nylon washers under the mounting bolts will block heat transfer.
                                 
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                                • Paladin06

                                  Paladin06 Well-Known Member

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                                  I happen to have one I can sell you. It’s brand new never installed.
                                   
                                • Paladin06

                                  Paladin06 Well-Known Member

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                                  Yes it’s going to hit 108 today. Not to bad. Waiting for those 115 days
                                   
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