Join Date: Dec 2008
Location: Tyler, TX
Thanked 407 Times in 347 Posts
"Cool fuel temp".
Nope. The fuel temp is a function of tank temp, engine temperature, and return flow. Moving more fuel thru the head by enlarging the orfice will only make it cooler for a SHORT TIME. As you move more fuel thru the head, it will transfer more heat from the head back into the fuel tanks, which will obviously increase the tank and then the inlet fuel temperature.
Stock, a Series 60 will RETURN 90 gallons/hour of fuel during "cruise" to the tanks. If you enlarge the orfice, it will return over 120 gallons/hr, and as much as 150 gallons/hr.
Returning more HOT fuel (much hotter than when it left the fuel pump) to the tanks, CANNOT reduce fuel temperatures, except temporarily.
I could go thru the math on how long precisely, but w/o knowing the new orfice size, it would not be worthwhile.
'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin
I vote for LIBERTY!