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Check Valve? 700 1990

posted by lucid on Wed Mar 2 14:53 CST 2011
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last visit: Fri Oct 24 12:31 CST 2014

[RELATED]

A likely culprit for your "warm hard start" may be the check valve in the fuel pump.

Contrary to a lot of conventional wisdom, the sole purpose of that check valve is to aid hot starts—rather than to hold pressure overnight. The theory is that by maintaining some pressure for a short time (the "residual pressure" spec is measured in minutes), it will prevent the vapor lock that might result from fuel boiling in the injector rail, due to heat soak from the hot engine.

--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

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Won't restart when warm [700][1990]
posted by Ajaxbuxton on Fri Feb 25 15:03 CST 2011 >

Won't restart when warm [700][1990]
posted by Chris Mullet subscriber on Fri Feb 25 16:19 CST 2011 > V
- Won't restart when warm [700][1990]
  posted by Ajaxbuxton on Fri Feb 25 22:31 CST 2011 > V
  - Won't restart when warm [700][1990]
    posted by aleekat on Fri Feb 25 22:38 CST 2011 > V
    - Won't restart when warm [700][1990]
      posted by Ajaxbuxton on Sat Feb 26 18:24 CST 2011 > V
      - Won't restart when warm [700][1990]
        posted by aleekat on Sat Feb 26 18:52 CST 2011 > V
        
        Won't restart when warm [700][1990]
        posted by Ajaxbuxton on Sat Feb 26 18:57 CST 2011 > V
        
        Won't restart when warm [700][1990]
        posted by Ajaxbuxton on Wed Mar 2 12:49 CST 2011 > V
        
        Won't restart when warm [700][1990]
        posted by aleekat on Wed Mar 2 13:30 CST 2011 > V

Won't restart when warm [700][1990]
posted by LucasC70 on Mon Feb 28 15:02 CST 2011 > V

Check Valve? [700][1990]
posted by lucid subscriber on Wed Mar 2 14:53 CST 2011 > V
- Check Valve? [700][1990]
  posted by Ajaxbuxton on Wed Mar 2 15:07 CST 2011 > V
  - Check Valve? [700][1990]
    posted by Ajaxbuxton on Thu Mar 3 09:10 CST 2011 > V

Won't restart when warm [700][1990]
posted by Ajaxbuxton on Mon Mar 7 10:50 CST 2011 > V

Won't restart when warm [700][1990]
posted by john sargent subscriber on Mon Mar 7 10:55 CST 2011 > V
- Won't restart when warm [700][1990]
  posted by Ajaxbuxton on Mon Mar 7 11:06 CST 2011 > V
- Won't restart when warm [700][1990]
  posted by JayTexas on Tue Mar 22 17:33 CST 2011 > V
  - Won't restart when warm [700][1990]
    posted by Ajaxbuxton on Wed Mar 23 08:03 CST 2011 > V
    - Won't restart when warm [700][1990]
      posted by JayTexas on Thu Mar 24 20:34 CST 2011 > V
      - Won't restart when warm [700][1990]
        posted by Ajaxbuxton on Fri Mar 25 14:01 CST 2011 > V

Won't restart when warm [700][1990]
posted by Ajaxbuxton on Wed Mar 9 04:29 CST 2011 > V

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Check Valve? 700 1990