How can one know if a "cheap" fuel pump works for a 280se? - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 04-13-2010, 03:25 PM Thread Starter
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How can one know if a "cheap" fuel pump works for a 280se?

Hey folks! Hope all is well. Weather is amazing! Just wondering about my 280se. I turn the key over, and its still not starting. I was wondering about how one can find out (or if any of you know), if the fuel pump I bought is giving enough pressure to be able to start my vehicle. I called a Mercedes dealership and the guy said you need exactly between 38-40 lbs. of pressure for this model...so my guess is that I may just need not a cheap fuel pump but the Bosch or whatever.. Thanks guys!
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post #2 of 8 (permalink) Old 04-13-2010, 03:39 PM
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Assuming you didn't buy a generic electric pump, the fuel flow should be on the box or the pump itself. This is one of those parts that needs to be OEM, and any old pump won't do the job for you.

Good luck.

"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck
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post #3 of 8 (permalink) Old 04-14-2010, 08:42 PM
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Originally Posted by DrJfrmLA View Post
Assuming you didn't buy a generic electric pump, the fuel flow should be on the box or the pump itself. This is one of those parts that needs to be OEM, and any old pump won't do the job for you.

Good luck.
Why does it need to be OEM?

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post #4 of 8 (permalink) Old 04-14-2010, 08:55 PM
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Why does it need to be OEM?
It doesn't but most cars don't run 38-40psi of fuel and you'd save a lot of time trying to make the stuff work by skirting around the solution with a factory correct part.

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post #5 of 8 (permalink) Old 04-14-2010, 10:24 PM Thread Starter
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Yeah all the other relays and stuff I bought for it are Bosch brand, but I was just in a hurry and excited to get it running, but I hope thats the issue! Thanks again guys!
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post #6 of 8 (permalink) Old 04-15-2010, 02:06 AM
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What model 280SE is it? W108, W116 or W126?
All three have different fuel pressures,the W108 is 14 PSI ,the W116 is 28 PSI and the W126 can run up to 70 PSI .
There are also three different pumps.
You need to use the factory pump because it plumbs into place with the filters on the W116 and W126 (which also has a pressure accumulator ) .You can run a W126 pump on the W108 easily and it will supply adequate fuel pressure and supply. Also a holley pressure pump will work on a W108 as long as you can get 14PSI and 1 liter in 15 seconds volume.

Regardless of which car you have you should invest in a Kjet fuel pressure test gauge. it can be used on all three and will tell you alot about the pumps condition etc. a lot cheaper than changing a pump which maybe OK.
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post #7 of 8 (permalink) Old 04-15-2010, 04:43 PM
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Originally Posted by HBguy View Post
Why does it need to be OEM?

Perhaps I should have said "OEM spec." There are after market pumps that are OEM spec pumps. That was my point.

As has been pointed out, the fuel pressure requirements vary. Rather than go through a hunt for an off-the-shelf pump, it seems simpler to get the original part--although it may not be cheaper.

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post #8 of 8 (permalink) Old 04-15-2010, 07:59 PM
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I had the same situation on my 58 so I put a clamp on the return line to the tank and it built up more pressure and now its running great.

Although my case is different cause I do not have the same motor but maybe if your lucky you can rig something like that.
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