getblown5.9

well i am ordering parts to rebuild my FASS, its only making 12idle, 10wot now and im worried with this heat 90+ degrees that its gonna take out my IP again. is there any other things to help prolong IP life...is there a good summer time fuel additive?

also with this heat my truck is a dog, just 2 weeks ago its was nice out, high 60's and the truck ran like a wild ape, but now its very sluggish and i can definitely feel the effect of the heat on my truck.

Diesel-Dan

If you just get that PS-1002 spring, that should stick you around 20ish if every thing else is working properly. If that is too high of pressure, i would suggest our Machined Return Fitting. It has 0.100" taken out of the Spring landing to reduce pressure to about 16-17 PSI.

When you talk to your dealer, ask for the following:

PS-1002
0.100" Machined Return Fitting......(We dont have a part number as of yet due to this is very new)

How old is your unit?

getblown5.9

dunno, it was on the truck when i bought the truck in july 04. would hold 15idle and 12WOT then.

now with bigger sticks and comp its getting weak. can you get me contact info for a dealer who can get me the part asap? thanks for the info

RowJ

No IP emergency with 12 psi/10 psi WOT, IMO.
New spring will be nice. With new PS-1002 spring mine is 19+ idle, 18.5 cruise, 17 WOT! Worth doing when you can but I would not loose sleep over concerns about a dying pump.

Stanadyne Diesel treatment is excellent for yr round. In summer will lubricate fuel lines/pump and protect against higher fuel temps in the lines.
Several tests have shown that fuel in the tank enters the lines at about 15* higher than OAT, or ambient temp. Higher fuel temps in summertime and southern climates can promote fuel deterioration resulting in greater likelyhood of gum & lacquer deposits.

RJ

getblown5.9

well i thought i read that like 80% of fuel the goes thru the IP goes back to the tank after cooling the IP so after a long drive would the temp of fuel in the tank rise to well above the OAT?

this info could be totally wrong, but for some reason 80% sticks out in my mind as the amount of fuel that gets used for cooling, while 20% goes into the engine

Diesel-Dan

AND that is prob only at WOT.....i have been kicking around the idea of a tranny cooler (To cool the fuel) plumed up to the 3/8's fuel line with a by-pass for winter.

BUT get this....WVO conversions require to heat the fuel to 160*+ before the fuel goes into the VP-44.......and many trucks are running just fine with this (But im sure there are plenty that have issue too.....anyone know?)......I wonder, does the WVO lube better? BUT i can say this is one of the main reasons i am not going with WVO. Im lookin at B-100....dont have to heat it......

Ph4tty

The more fuel in your tank the less the heated fuel from the return line will warm the rest of the tank. Fill er up =P

RowJ

This would seem logical...but the extensive testing I followed on another site...says not so!
Apparently so much fuel is by passed through the VP-44 for cooling (70% is the figure I remember) that the +15* over OAT seems very consistant for fuel leaving the tank....no matter what the level is in the tank.
Note: I don't recall testing was done below 1/4 tank.

RJ

getblown5.9

so guess when i go on a long road trip this summer in 100* heat, i should stop every 100 miles to keep the tank full?

i get what you are saying tho, my truck is almost AWAYS above 3/8 of a tank unless im on a long road trip stretching for say 600 miles on a tank, then ill run it low before filling it up

Ph4tty

Where was this posted? TDR? I stand corrected =\

RowJ

Yes! I believe it was the testing done by several...but started by Bob Weis. (rweis). Maybe 10 pages on the site. Purpose was to prevent VP-44 failures from heatsoak after shutdown.
But before they realized that was main source of problem he set temp sensors all over the fuel system...incl return lines and VP-44 inlet hose, and analysized many scenarios. Tank temps were done with heat guns on the outside.... but turned out to be in total agreement with all other readings.
I,myself tried it. Ran 400 miles at 75 mph, on an 85* day...non stop on the Interstate, starting with a full tank. Pulled off Hwy and immediately used heat gun on tank... frt, middle & rear. Reading were 99*, 100* & 101*...with 1/3 tankful left.

I would assume the fuller the tank...the longer it takes to heat up the fuel. But with 70% bypass...I can't see it taking very long?

RJ

Diesel-Dan

I wonder why we dont see more with fuel coolers? I know with the FASS, it would be a VERY easy thing to do.......and Rowland, down in your area...you would never have to worry about by-passing it at all. The coldest it got this last year in the Red River Valley......15-18* F? You might have been a little cooler......

I may mess with this some......Tranny coolers are VERY cheap.......

RowJ

The reason we don't see more is that this testing saw the major problem for the VP-44 was after shut down.... Heat soak to the VP-44 raised temps 50*.
All the fuel line coolers in the world won't do much if the engine is shut down. What these guys started working on was Cooldown timers for electric fans. mounted under the hood!
In our 9 months of 90* days, I now run a floor fan under the engine compartment whenever I park at home in the garage.

RJ

RowJ

Found it!
http://www.turbodieselregister.com/f...d.php?t=135952