my 1988 300te died while driven it has had both fuel pumps and filter replaced in the last 12 months im getin power to the pumps but getting no gas to the engine. i drained the tank from the bottom hose and it had good flow at first but slowed down to less then half could this be why im not getting gas to the engine? what should I do???

Tank filled? I had a sender telling me I had gas, but had none. System is simple. Your bottom tank filter is good based on your "good flow". Remove line in engine bay coming from the back, put 12 volts to either or both pumps and you should have flow if the tank is not empty. If still no flow remove the pumps and filter. You can check the filter with compressed air and the pumps on the bench. Put them in a plastic bottle inlet side down with a tube attached to the outlet running back into the bottle. Add in some gas and apply 12 volts to check flow. Connect the voltage to the system away from the bottle just in case the connection (switch) sparks on contact. The pumps can spin nicely and still not produce volume if the tolerances grow too large. Are you sure you got NEW pumps and not refurbished or shop recycled pumps?

thank you both are new pumps I will try your sudjections..

I tested both pumps they work great but they are not getting power to them my relay was new when I got it last year in may does anyone have any Ideals where to start looking from here??????

Test the power wire from the relay to the pump. Pole 87 on the relay.

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600SEL '91
300E 4Matic '88
240D '83
280SE '77
350SE '73
The most complex systems can fail in the simplest way.
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