Fuel not consistently flowing after sitting TOO long- 1972 280 SE - Page 2 - Mercedes-Benz Forum

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post #11 of 16 (permalink) Old 09-07-2006, 08:56 AM
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If the car is a 6-cylinder, it's the same. It's a V8, it's different.

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post #12 of 16 (permalink) Old 09-08-2006, 05:12 PM
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When you first turn the key over (but without cranking the engine), you should hear the pump run for about a second or so. When I bought my 108, I had similar issues, so I replaced the fuel filter and pump, and ran all the gas out of the system before putting more in. I'm thinking that if you had the pump "unstuck," then it's got some issues still. The pumps can run on the pricey side, but I've seen them about $250 on eBay ...

Replacing the pump and filter is pretty easy and quick too.
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post #13 of 16 (permalink) Old 09-08-2006, 05:27 PM
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Originally Posted by Grubeguy
.......but I've seen them about $250 on eBay ...
New or reman? Either way, the 6-cylinder pump costs more than yours...

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post #14 of 16 (permalink) Old 10-04-2006, 01:36 PM Thread Starter
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The fuel pump is ok, or at least does pump fuel before it turns off from pressure (I think). The filter in the tank looked like a candied apple, so it was replaced. I've replaced the fuel filter, the entire hose up to the fuel damper, and replaced the fuel regulator, and all of the hoses on the rails. Fuel does flow through the damper, but does not get through the new Bosche regulator. They used white paint on the adjustment nut, so I didn't want to mess it up. Can the damper cause a problem? Do I need to get an in-line fuel pressure gauge and measure the pressures? What should they be at the fuel damper? What should they be if I adjust the regulator?
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post #15 of 16 (permalink) Old 10-04-2006, 04:14 PM
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Fuel pressure 28-32 psi at the regulator. If you need more specs;

http://www.benzworld.org/forums/w116...eshooting.html

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http://i30.photobucket.com/albums/c328/nutz4benz/W123/6C3A9CA5-EDFF-4834-8125-34B70B20A676_zpsiyesrawz.jpg
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post #16 of 16 (permalink) Old 10-04-2006, 08:18 PM Thread Starter
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Thank you for that link. I did a forum search and found that link this afternoon and printed it. I think I will have to go buy a pressure gauge. I just verified again that the fuel pump has no problem pumping fuel when the fuel line is disconnected before the damper. Then, I hooked the fuel line directly to the regulator, but no fuel came out (with the output hoses disconnected). It seems like it builds quite a bit of pressure, because fuel sprays out when I unhook a hose, but I'm not sure right now exactly how much. And, I'm not sure what the new regulator is set at. I do know that it is frustrating!
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