Losing fuel pressure

[Clare Snyder]

andy quaas wrote:
> 
> I have an externally mounted in-line fuel pump on my truck.  I have
> noticed in thehot wisconsin summer that the pressure runs from 14.5
> psi (what it should be) all the way down to 12 and sometimes 10.5 psi
> after a good 40 miles jaunt on the interstate.  I was once told that
> the heat was somehow making the gasoline "boil".  Is this true or is
> my pump going out.  It has a steady 14V at the pump the entire time
> and the gas tank can be full or 1/4 full.  help!!!!
> 
> Andy Q
> 
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Where is the pump mounted? If  it is at the engine compartment, for
instance, and the fuel line runs parallel and close to the exhaust (
close is relative, a foot from an unsheilded cat will do it) the fuel,
being quite warm, CAN boil when the pressure drops even a small amount
below atmospheric between the pump and the tank. A restricted inlet
filter can cause the symptoms to be more evident.
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                       ISP trouble again!!!
                I am now clare.snyder.on.ca at ibm.net
              Hopefully Snyder.on.ca will be back up soon

                           Clare Snyder
                         Waterloo, Ontario