68 280se fuel issue? Help - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 04-01-2010, 02:15 PM Thread Starter
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Date registered: Apr 2010
Vehicle: 2001 E430, 1987 560SEC, 1968 280SE
Location: Dana Point, CA USA
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68 280se fuel issue? Help

Hi guys, Just bought a 68' 280se. I think I have a fuel pressure problem but need to be sure. Psi out of the rear pump is minimal. No gauge to give actual number but barely pissing.
Near as I can tell by searching this forum, I think I should have 15+psi?

If this is correct, I think I know the issue but need some verification on that rear pump's pressure.
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post #2 of 3 (permalink) Old 04-01-2010, 02:39 PM
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Vehicle: '72 280SE barn find
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Yep it's 15psi. The flow is also an issue about 1 gallon per min at the return to the tank.

If it's not broke it dosen't have enough features.
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post #3 of 3 (permalink) Old 04-01-2010, 03:47 PM
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Sounds like a blockage from the tank. If the pump actually moves fuel it will be OK.
If you can get a minimum of 10 PSI, that will be enough pressure but volume is the critical factor.
It's 1 liter in 15 seconds measured at the cold start valve.
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