Prime the Fuel Lines?
09-30-2015, 10:23 AM
#1
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2002 c240
Prime the Fuel Lines?
I swapped out my fuel pump and though the fuse no longer pops, the car won't start.
It seems like I'd need to bleed the lines of air and replace with fuel, how do I do this?
It seems like I'd need to bleed the lines of air and replace with fuel, how do I do this?
09-30-2015, 02:07 PM
#2
Super Member
Open the ignition key to the "On" position (position 2) but don't crank the engine. Leave it in position 2 for about 2-3 minutes. After that, go ahead and crank the engine - it might still take a little bit of cranking but it should start fairly soon.
When you open the ignition key as instructed above, the fuel pump will run and fill up the filter, new pump & fuel lines.
When you open the ignition key as instructed above, the fuel pump will run and fill up the filter, new pump & fuel lines.
09-30-2015, 02:53 PM
#3
Out Of Control!!
Don't waste your time thinking about bleeding the fuel pump--it doesn't happen---you need to check your install and also the rear SAM fuel pump relay and the front SAM engine relay plus all the R AND F SAM fuses.
This all assumes that you of course purchased a new pump not APOS ebay pump from the Caucuses!
This all assumes that you of course purchased a new pump not APOS ebay pump from the Caucuses!
10-01-2015, 07:45 AM
#4
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2002 c240
Open the ignition key to the "On" position (position 2) but don't crank the engine. Leave it in position 2 for about 2-3 minutes. After that, go ahead and crank the engine - it might still take a little bit of cranking but it should start fairly soon.
When you open the ignition key as instructed above, the fuel pump will run and fill up the filter, new pump & fuel lines.
When you open the ignition key as instructed above, the fuel pump will run and fill up the filter, new pump & fuel lines.
"the rear SAM fuel pump relay and the front SAM engine relay plus all the R AND F SAM fuses"
But just in case I did order a relay that the auto parts store claimed to be the fuel pump relay but seeing as the pump runs is there a need to check/replace the relay?
I bought a Bosch fuel pump from one of the sponsors here that also happen to be in Simi Valley, an hour and change from where I live
10-01-2015, 10:35 AM
#5
Out Of Control!!
I should have removed my post because when you said "won't start" and assumed the fuel pump was not running-------once you said you could hear the pump run my suggestion was no longer valid because if the pump was running the relay in the rear SAM was good.
Regarding nomenclature used on the forum---I rely on the members to do some homework themselves to understand his or her car---don't be lazy google MB rear SAM, its amazing what you can learn yourself about your car!!
we still do not know if the issue is fuel or electrical---have you loosened an under car fuel line to determine whether pump is pumping fuel---have you removed a plug to determine whether there is spark!!----start testing!!
Regarding nomenclature used on the forum---I rely on the members to do some homework themselves to understand his or her car---don't be lazy google MB rear SAM, its amazing what you can learn yourself about your car!!
we still do not know if the issue is fuel or electrical---have you loosened an under car fuel line to determine whether pump is pumping fuel---have you removed a plug to determine whether there is spark!!----start testing!!
10-03-2015, 03:48 AM
#7
open the schraeder valve on the fuel rail too see if the rail is priming.
