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Old 12-15-2004, 02:00 AM
DieselBone's Avatar
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Location: Mechanicsburg, Pennsylvania
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fuel pump for my 1970 280SEL

Hello, I tried to search for this topic, but I haven't it....so here it goes!

I bought my 280SEL is a non-running condition (needs paint, but interior is BEAUTYFUL) The owner said it ran a few months ago, but has since not. The fuel pump wasn't working, and the tank had really nasty gas in it, the fuel filter too. Anyway, the old pump is junk, its the smaller type BTW, I was wondering if there was a cheaper fuel pump I could buy like at autozone or somewhere. I know a new pump cost 300+. I forgot what the PSI is, but I think its 20-30PSI????? Also, is there anything else I should do beside blowing the fuel lines out before I fire it up????? Thanks for you help guys!

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Old 12-15-2004, 04:11 AM
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Location: Northern Va.
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Do a search on 'fuel pump' in the vintage section, this one. They get gummed up from bad gas. Don't try to start the car or you can damage the injection pump. You will need to drain and refill all the fluids including the injection pump. The IP is a precision device and it must be kept clean. There is a fine mesh fuel filter on the engine mount. There are fuel dampers on the inlet and outlet hose to the IP. The fuel pump itself is a low pressure high volume pump. some can be rebuilt.

Do a search.
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Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.
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Old 12-16-2004, 08:07 AM
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I was just faced with the exact same problem on my '73 280SEL 4.5. In my ignorance I bought the aftermarket pump Autozone (or the like) recommended. It wasn't until I read Peter's post on flushing the old fuel pumps that I realized I had made a mistake. I took the old pump out, took the cap off carefully, worked it back and forth by hand until it broke loose, flushed it out like Peter said, and viola.

I am looking forward to putting my fuel tank in tomorrow and taking it (the un-named car) for my first drive.

Hope this helps
Paul
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2001 Honda Accord

1995 Jeep Cherokee

1973 MB 280SEL 4.5
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Old 12-16-2004, 11:54 AM
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The 4.5 efi pumps are high pressure pumps where the 6 cyl mechanically injected pumps are high volume low pressure. They are as different as night and day.
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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.
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Old 12-16-2004, 05:40 PM
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Location: Mechanicsburg, Pennsylvania
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yes, the 4.5 and others use a different pump, much higher pressure. The pump on mine is too far gone to rebuild. I did research on the holley 12-927 inline pumps, has anyone used this pump??? It seems like it would flow enough fuel. 15 psi I think would work out fine. But like others said, its flow not psi.

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