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Bad Fuel Pump? |
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mudslinger 
AMC Apprentice 
Joined: Jan/03/2009 Location: Houston Texas Status: Offline Points: 180 |
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 Topic: Bad Fuel Pump?Posted: Feb/17/2019 at 1:38pm |
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Hello Gang,
Recently, on cold starts the car runs rough and stumbled until the engine temp gets to 125, then it runs fine. I just drove and parked it and now the carb isn't getting fuel as the front site bowls are dry. It's a fairly new quick fuel carb. Thanks for any suggestions. |
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1970 AMX 390
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wheelz
AMC Apprentice
Joined: Jan/29/2019 Location: NJ Status: Offline Points: 101 |
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Posted: Feb/17/2019 at 2:08pm |
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Check fuel filter
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mudslinger
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Joined: Jan/03/2009 Location: Houston Texas Status: Offline Points: 180 |
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Posted: Feb/17/2019 at 2:20pm |
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It's a fram filter, I just replaced the element.
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1970 AMX 390
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wheelz
AMC Apprentice
Joined: Jan/29/2019 Location: NJ Status: Offline Points: 101 |
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Posted: Feb/17/2019 at 2:25pm |
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What kind of pump ?
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Posted: Feb/17/2019 at 2:30pm |
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If no backfire on cold start my guess would be RICH not lean.
Once heated up the heat help vaporize the over rich condition. Sounds to me like the front bowl is draining / leaking into the engine. An excess of fuel rather than shortage. A lack of fuel on cold start up will cause a backfire for sure.
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mudslinger
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Joined: Jan/03/2009 Location: Houston Texas Status: Offline Points: 180 |
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Posted: Feb/17/2019 at 2:50pm |
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It's a stock fuel pump. When I shut it off, it did have a slight run on.
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1970 AMX 390
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PHAT69AMX
AMC Addicted
Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Posted: Feb/17/2019 at 2:56pm |
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Carefully remove the Primary Fuel Bowl Needle and seat, gently blow it out,
look for minuscule debris, re-install, re-set float level using sight glass, see what happens. Sometimes just fiddling with it will straighten it out. Hold Needle Nut, crack loose Locking SCREW, then carefully unscrew Needle from bowl using the hex. I like to put some vaseline on the 2 Needle Gaskets and the Needle O-Ring. be careful with the lubricated O-Ring when removing replacing the Needle into the bowl. Or if feeling ambitious, first remove the Front Fuel Bowl.
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