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#1
07-27-2003, 02:48 AM
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fuel pressure & pump action
hello forum
on the 72 350sl i've got most all the wiring replaced that was showing signs of cracking or failing in the ignition. the wire (+) pos from the coil to the distributor had 2k ohms of resistence by itself. the new wire virtually zero. anyway my question? I installed a pressure gage in the fuel line (ring). activated the pump and the fuel pressure went to 20psi (appx 1.4 bar) then dropped to 0 psi. did this repeatedly. you could hear the different solenoids/relays tripping but the fuel pressure just went back to 0. this 72 has electronic fuel inj. the book calls for used injectors to have at least or a minimum of 43 psi to open. new injectors require 50 to 58 psi. i'll be going exploring tomorrow for the fuel filter and pump.... but can anybody tell me why it would rise then fall to zero? the way i see this is the pump made the initial pressure to 20 psi but a back door must open up for the pressure to drop back down. can anybody shed some lite on what is taking place? tks craig
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Thanks Much! Craig 1972 350sl Red/Blk 117k 1988 420sel charcoal/Blk 140k 1987 420sel gold/tan 128k See My Cars at:http://mysite.verizon.net/res0aytj/index.html Pound it to fit then Paint it to match! There is only First Place and Varying degrees of last! Old age and deceit will overcome Youth and Enthusiasm every time! Putting the square peg in the round hole is not hard... IF you do it fast enough! Old enough to know better but stupid enough to do it anyway! 
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