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Author
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Topic: question about fuel pumps?please help
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phat50
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Member # 1998
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posted
 
 
well i have a 190lb fuel pump and was wondering if they can work inproperly if you drive on empty all the time,i only ran out of gas one time but i always be driving on almost empty,can that afect the pump?its not makeing any loud noises or anything it just my fuel presure guage gose up when you give it gas but if you rev it wot it will go up like it supost to but will drop a little bit while still on the gas,it wont drop all the way down,just like 2psi or 3psi is that supost to happen?and if i do change the pump would it be ok to run a 255lb or will it hurt somthing?
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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phat50
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Member # 1998
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posted
anyone?please help
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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99gt-UJSTLST
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Member # 584
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posted
well are you on empty when you see this problem
or does it happen when you on a full tank of gas
and if you change to a bigger pump it wont hurt the car
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Posts: 2558 | From: SAN JOSE CA | Registered: Nov 2001
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CobramanPhil
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Member # 2170
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posted
The only thing that lubricates the fuel pump is.....guess what....fuel. The pump is essentially a small turbine type of hydraulic unit that is coupled to a magnet motor (voltage affects the efficiency of the motor). When you run your tank completely dry there will be cycle lapses of fuel that will run through the pump (or the pump will be completely run dry). In any case you wil basically be running "metal on metal" and the pump will heat up which will eventually cause it to seize or at least stick (even with the proper voltage). Once it starts doing this (yes it is a downward spiral) there is no way to fix the problem with the pump (unless you open it up and replace the gear/turbines in there, but that will be harder then to simply replace the pump).
So the general rule is to not run near empty or on an empty tank as you will heat up the fuel pump and causing premature wear and or siezure. Getting back to the other part of your question..will the 255lph tank hurt anything...nope...generally it will not hurt especially if you have mods that require the extra fuel volume.
[ March 03, 2004, 11:23 AM: Message edited by: CobramanPhil ]
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Posts: 1016 | From: California, Bay Area | Registered: Dec 2002
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