All,
I try not to bomb the list with Non Tiger stuff, but we are a bit desperate,
and you all can be so helpful.... I guess it could apply to a Tiger...the
dynamics of the system aren't any different that I can think of. ...and we
really need some good advice...
Here is the situation, my good friend and I have built an early 70's full size
ford truck 4x4...The fuel pressure falls off slowly from 6.5 psi on the gauge
to about 3 or so....and eventually even lower until it tries to die as the
engine warms up...over the course of a few miles driving or several minutes of
engine at full operating temp.
Here is what we have tried:
1. considered a bad fuel pump, replaced it with new and it didn't change
2. considered a bad regulator, replaced it with a brand new one from summit,
didn't change
3. considered a bad gauge, replaced it with no change
4 considered a problem with venting in the tank or not enough vent...checked
the cap and vent line and its fine, no change
5. considered vapor lock....if this is true, what causes it and how do you fix
it? the fuel line is routed in nearly the exact same format as the
factory...cant imagine what would cause it....
6. re-routed the fuel system with soft line to by pass regulator and remove
line from near engine...no chance in the problem
Any ideas would be appreciated....we are getting desperate....here is how its
setup in case it matters:
Engine and such:
Ford 351 Windsor - roller conversion
9.3:1 compression, forged pistons
Edelbrock aluminum heads
comp cam (521/536 lift, 230-ish duration)
Edelbrock 650cfm Thunder AVS carb
Edelbrock Performer RPM intake
Shorty headers with 2-1/2 mandrel bent exhaust
Fuel system specifics:
Stock tank
Stock 3/8-inch lines from tank to pump
Summit Mechanical 'high volume' fuel pump - 110gph, 8 psi
-6 AN braided hose from pump to regulator
Adjustable regulator - set at 6.5psi
-6 AN braided hose from regulator to filter
In-line fuel filter right at carburetor
Full tank of 91 octane fuel
Thanks Friends!
Cullen
_______________________________________________
Support Team.Net http://www.team.net/donate.html
Tigers@autox.team.net
http://autox.team.net/mailman/listinfo/tigers
http://www.team.net/archive
|