I thought the lift pumps mounted on the fuel filter housing only developed 4-5 psi... ?

 

My boss has a 2001. Put in tank pump in. Now he thinks the ip is going. Missing and white smoke. Time to talk him into a gauge.

 

Why does low fuel pressure cause WHITE smoke?

 

It don't, but a failing vp44 does
the stock lift pump by the fuel filter will put out 15 psi (when new), the in-tank pump is the low pressure pump, around 8 psi at idle

 

[QUOTE=blackdiesel;1120005]It don't, but a failing vp44 does[QUOTE]

OK - so why does a failing VP44 cause white smoke...

Huh - my buddy has an '04, he's got lower fuel pressure than my in-tank pump; his pressure hasn't really changed from new, from what I hear.
He's approaching 50K miles.

 

intermitten white smoke is just one sign of a dieing vp44, I would say that it's low pressure on the HIGH side; Your buddy has a common rail, toldly diffarent fuel system, I thought we were talking 2nd gens here.

 

Sure - low HIGH pressure from a CP3 also makes white smoke... I know it's a fundamental question (dad - WHY does 2+2=4?), I was just curious why the smoke is white just because the engine is running (I imagine) way lean?

I'm used to:

black smoke - extra fuel
blue smoke - too much oil
white smoke - too much antifreeze or water
WOT haze - well-tuned diesel
green smoke - too much chili

 

He said he paid around $500 for his. He couldn't rember the name of it. Does that sound like the normal in tank pump?

 

that's what the dealer is charging, or more. you would be alot better off with a top of the line fass system for that much money