Wanted to ask about this thing I noticed as I was hoping for good MPG's (eventually)
When my motor was running on the engine stand- I had done very little to the fuel system. All the injector tips were bad, was running the old rubber diaphragm fuel pump- injection pump was stock (I think) - still I thought it ran OK (smooth)
I had the fuel pump drawing out of a gallon paint can with about 3 inches of fuel in the bottom. I noticed I could let it idle
for a couple hours and not really see much of that fuel missing from the can. Couldn't have been more than 2 qts. Also I could
see a little trickle of fuel coming back to the can through the fuel return line.
Fast forward--- new injector tips, IP overhauled for new O-Rings. New head gasket. New 60Lb+ valve springs, new chr-mo
push rods, new head gasket, new crank oil seals, KDP, New 2-nd gen piston fuel pump with 12 lb spring, Overhaul shop said they turned pump up a little (they said 20%) , new manifold, using old turbo H1C with new center seals.
After all that work - now I see no more fuel coming out of the return line. The motor is in the truck now- I am suspicious that
it could be using too much fuel compared to what I wanted....... don't see any smoke except for a little at first start up.
Don't have a pyro on it yet... or water temp ...... or boost...... those are next on the list.
What does it indicate that no fuel returns to tank ? (should I check oil just in case volume increasing ????)
Could it just be turned up too much ? Seems to have plenty of power when I drive it round the yard- (93 intercooled
engine in a 2004 ford 350 ) No black smoke anytime so far.....
Thoughts ?
Tim