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What does this pump do exactly??

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Old Nov 22, 2008 | 11:25 AM
  #1  
nightskyisme's Avatar
nightskyisme
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From: Albany, NY
What does this pump do exactly??

In my quest to find out why my truck is so hard to cold start (see previous post) my buddy said the pump under the driver's door along the frame rail is a "lift assist pump" and is supposed to assist in keeping fuel pressure constant. Is this true? How and what does this pump actually do? Can I test it? I thought the pump was in the tank....
 
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Old Nov 22, 2008 | 11:26 AM
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jdecker88
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That is your fuel pump.
 
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Old Nov 22, 2008 | 11:54 AM
  #3  
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PowerstrokeJunkie
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The pump that supplies oil to the HPOP is the main lube oil pump, on the crankshaft at the front of the engine. That pump however is your fuel pump. Never take advice from your buddy again lol
 
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Old Nov 22, 2008 | 11:59 AM
  #4  
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nightskyisme
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Sorry, my bad, I meant to say he stated is WAS a fuel pump, I was thinking while typing about how the oil is integral in operating the fuel injectors.
I thought the fuel pump was located in the gas (diesel) tank, no? If this pump gets "lazy" could that contribute to poor cold starting?
 
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Old Nov 22, 2008 | 01:12 PM
  #5  
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rbaker6336
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no pump in tank
if you having cold start problems could be glow plug relay,glow plugs or battery voltage
 
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Old Nov 22, 2008 | 01:41 PM
  #6  
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nightskyisme
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Thanks guys......
 
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