Has anyone had a fuel pump,that tested with good pressure.But failed at fuel volume?
I really think that is my problem all along.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

Have you checked the fuel pressure regulator on the fuel rail and its vacuum line ?

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1971 280SL ROADSTER
1988 300CE TWIN TURBO WIDEBODY
1994 E320 CABRIOLET
1999 C43 AMG
2005 G55K AMG
2008 CLK63 AMG BLACK SERIES

yes sir,new regulator,pressure rises to 60 psi under light load,never checked high load.Car feels like its running out of gasoline.I heard a pump can test good on pressure but fail on volume. Pump has 178,000 miles.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

IF ... you have a check valve in the return line check that.

Bought a lovely Volvo wagon with a bad check valve. A quarter got me a good working one at pnp.

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1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."

A clogged fuel filter can do that.

Also gas tanks can have crud inside them which restricts flow. You can use a lighted USB inspection camera to peek inside the fuel tank.

I'm going to do the 35 second test with a one liter bottle.If it fills the bottle its ok.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran