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Old 04-14-2003, 08:32 PM
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pmizell pmizell is offline
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
"Fuel leakdown" causing "vapor lock". Possible causes could be "accumulator", testing "fuel pump" draw for proper amperage (one pump not working) or bad "fuel pressure regulator".

Pull the fuel pump relay (behind battery) and test the amp draw with an ammeter or a multimeter between pins 7 and 8. The proper range is between 6 and 8 amps. Anything more and you probably have a bad pump.

To test the FPR, pull the vacuum line off and see if any fuel is leaking out. If so it needs to be replaced. You can also check the fuel pressure at the fuel return line coming from the FPR for proper pressure. I forget the specs.

Do a search on any/all of those topics and you'll have enough to read for days.

'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi

Last edited by pmizell; 04-15-2003 at 02:30 AM.
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