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#1
10-24-2019, 11:51 PM
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MFI aftermarket fuel pump
All, I need to get an aftermarket pump for my 300SEL 6.3. I suspect it's the same as the pump for the fuel injected M130 engines. Anyone use an aftermarket pump or know the pressure and flow rate?
Thanks
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With best regards Al 
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#2
10-25-2019, 09:03 AM
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Al, If your car is D-jet or K-jet there are a lot of aftermarket pumps available.
https://www.amazon.com/Bosch-69435-Original-Equipment-Replacement/dp/B001LPLB5G I'm currently using the Autotop one for a temporary replacement in my '85 500SEL. Haven't had any problems with it so far so it might become the permanent replacement.
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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now Last edited by Mike D; 10-25-2019 at 09:09 AM. Reason: better link
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#3
10-25-2019, 11:40 AM
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Mike,
Thanks. the car has mechanical fuel injection with an injection pump similar to that used on diesels. I've read in different places that the pump is somewhere between 12-20psi at about 135 GPH.
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With best regards Al
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#4
10-25-2019, 11:51 AM
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Yup, I was afraid of that. You probably should send Frank Reiner a PM. He could probably give you a line on a substitute. Isn't TOMGUY a fellow W108'er?
__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#5
10-31-2019, 10:14 AM
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Yep, but I've had no firsthand experience with the 6.3.
Does the pump leak, or is it actually bad electronically? These can be re-sealed.
__________________
Current: 2021 Charger Scat Pack Widebody "Sinabee" 2018 Durango R/T Previous: 1972 280SE 4.5 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi" 1999 Chrysler 300M - RIP @ 221k
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#6
10-31-2019, 12:04 PM
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The service manual says to measure the pressure at the cold start valve, or on one of them anyway.
It says to disconnect the fuel line to a cold start valve, attach a pressure gauge and turn on the ignition. Make sure you are registering at least 11 volts at the battery. Then the pressure should be between .08 to 1.1 atu. In other words, the pressure should be one atmosphere, or 14 psi. This seems quite low to me since I am used to D-jet systems that run at 42 psi. But this is what the manual says. By the way.... Are you not in Dallas? If so the Dallas downtown library has a nice selection of early Mercedes manuals in the fifth floor reference section. I know they have a 6.3 manual because I have used it at one time or another when sorting out a friends 600.
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#7
11-01-2019, 12:00 PM
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You need a minimum of 10 PSI and 1 liter of fuel volume in 15 seconds. A fresh fuel pump will produce up to 15 PSI and one liter of fuel volume in 15 seconds.
As you go down in pump pressure the volume will go down with it. At 10 PSI you can expect maybe 750 ml in 15 seconds which is right at the cutting edge of not starting or running. You can test fuel pressure at a cold start valve ( there are two of them of a 6.3 ) but the fuel volume should be checked after the damper in the return line or even at the return hose at the front of the fuel tank. I usually blow compressed air through the return line going back to the tank to make sure there are no restrictions. Remove the fuel tank cap before doing this!
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