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How big of a fuel pump to go?

5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

How big of a fuel pump to go?

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Old 09-21-2006, 04:05 PM
  #21  
grumpyphillips
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Default RE: How big of a fuel pump to go?

Sorry guys. Typo. They are 19 lb injectors and the MAF was calibrated for them. Sorry for the typo.
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Old 09-21-2006, 04:06 PM
  #22  
88BlueGT
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Default RE: How big of a fuel pump to go?

Ok because that could be a problem with your idling, etc. if you had 19lb injectors and a MAF that was calibrated for 24's.

I would still toss that MAF and go with something smaller.
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Old 09-21-2006, 04:11 PM
  #23  
grumpyphillips
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Default RE: How big of a fuel pump to go?

So, should I change the fuel filter and fuel reply before I change the fuel pump?
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Old 09-21-2006, 04:13 PM
  #24  
PX429
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Default RE: How big of a fuel pump to go?

ORIGINAL: grumpyphillips

So, should I change the fuel filter and fuel reply before I change the fuel pump?

No, you just changed it a few months ago. that's not your problem.


Make sure it's your fuel pump before you change it. Run a pressure chck on it
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Old 09-21-2006, 04:16 PM
  #25  
7upedition
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Default RE: How big of a fuel pump to go?

stock fuel pump flows 90 lph, and if your MAF isn't cal'd to the stock 19lb injectors then the motor will choke on the extra fuel and run very rich. i agree on the suggestions above, go 155prm intank fuel pump with external inline regulator and cal'd 73 mm maf. If your MAF is way bigger than your intake inlet port theres no point to it, you want to TB to match the intake inlet and the MAF to be a few mm bigger .... good luck, and clean the injectors that may help!
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Old 09-21-2006, 04:21 PM
  #26  
grumpyphillips
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Default RE: How big of a fuel pump to go?

My injectors are brand new 19lb Ford Racing ones that were installed only 3 months ago.
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Old 09-21-2006, 04:27 PM
  #27  
7upedition
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Default RE: How big of a fuel pump to go?

okay, thats great! is the MAF calibrated for 19Lb injectors?
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Old 09-21-2006, 04:30 PM
  #28  
grumpyphillips
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Default RE: How big of a fuel pump to go?

Yes, the MAF is calibrated for the 19lb injectors.
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