fuel pressure question

[WBofTN]

I noticed today that my fuel pressure starts out around 6-7psi, but
once the car is hot (driven for 5 -10 miles) the pressure drops down
to 3psi. Is that normal????
WB

'93 Unique 427/351W/4sp

[Jim Harding]

WB,

I've seen and heard of this happening many times when using liquid filled gauges. I went through two of them before going to a 'regular' gauge. If you have a liquid filled gauge, my money says the fuel pressure is OK, and the gauge is faulty.

Jim Harding
La Plata, Maryland

1982 #3004
http://www.capitalareacobraclub.com/albums/album26/1aLeftside.thumb.jpg

[ericeckhoff]

I had that problem with a mechanical pump. Cold 6psi hot 2.5psi. I now have holley electric--6.5 psi hot or cold. vdo guage on regulator.
Eric

[WBofTN]

My gauge is a cheap "Jegs" unit. Probly nothin to be conserned about.
WB

'93 Unique 427/351W/4sp

[spd4me]

The Holley rep told me the fuel pressure should be between 5 and 7 lbs. and to make sure it doesn't go over 7 lbs.