Author Topic: fuel pump  (Read 542 times)

Heyno Sauermann

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fuel pump
« on: November 20, 2022, 17:19:36 »
Any leads on an after market fuel pump other than the $1000 Bosch.  My short pump won't run under pressure-the diagnoses points to degraded permanent magnets.

Pinder

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Re: fuel pump
« Reply #1 on: November 20, 2022, 18:13:56 »
What makes you  think its the magnets? how did you test that? I would think all it needs is a rebuild.  you can get  a rebuild kit and try that. from Vintage Euro parts. with new impeler and armature etc. I would highly doubt its the magnets.
1970 280 SL Light Ivory DB 670. 4 Speed manual shift no AC Limited Slip Diff.

Heyno Sauermann

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Re: fuel pump
« Reply #2 on: November 20, 2022, 21:57:57 »
I'm well into the project.  New brushes and impeller.  Bushings have all been measured , rotor checked for shorts etc.
Runs fine on bench - add fuel to the equation and it stops....

MikeSimon

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Re: fuel pump
« Reply #3 on: November 20, 2022, 22:07:38 »
Isn't there a member here who rebuilds them? Or sells rebuilt units in exchange for cores? Baron Youngman?
1970/71 280SL Automatic
Sandy Beige
Parchment Leather
Power Steering
Automatic
Hardtop
Heated Tinted Rear Window
German specs
3rd owner

Tycoon

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Re: fuel pump
« Reply #4 on: November 20, 2022, 22:42:39 »

 I purchased a temporary Carter P4601 hp with correct fuel circulation rates, etc. till I got my original Bosch rebuilt by Fuel injection Corp in California. The Carter is affordable, and works great, but slightly loader.  You may not need to spend the $ on your original, until you are ready……at least you’re driving!

Bill

BobH

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Re: fuel pump
« Reply #5 on: November 20, 2022, 22:56:14 »
Not wishing to teach you how to suck eggs, but are you sure the polarity is correct and the pump is running in the right direction, assume no fuel delivery if the pump runs the wrong way, but is there a chance it could stop the pump from running?

Pinder

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Re: fuel pump
« Reply #6 on: November 21, 2022, 16:49:51 »
check impeller is right way up.
1970 280 SL Light Ivory DB 670. 4 Speed manual shift no AC Limited Slip Diff.

stickandrudderman

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Re: fuel pump
« Reply #7 on: November 21, 2022, 18:06:58 »
For those not bothered by originality I recently discovered this pump:
https://www.thinkauto.com/acatalog/On_line_shop_Holley_328.html

They sell it without the regulator and it appears to have all the specs to satisfy the needs of the 113. It looks similar too which might help.
« Last Edit: November 22, 2022, 09:26:37 by stickandrudderman »

Cees Klumper

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Re: fuel pump
« Reply #8 on: November 21, 2022, 19:08:02 »
Stick, I get a 'not found' when I click the link, can you repost please? I am sure this will be of great interest to us all. Thanks,
Cees Klumper
1969 Mercedes 280 SL automatic cream white
1972 Lancia Fulvia Coupe 1.3 rosso corsa "Luigi"
1990 Ford Bronco II 2WD colonial white

BobH

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Re: fuel pump
« Reply #9 on: November 21, 2022, 20:03:02 »

Bshaunessy

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Re: fuel pump
« Reply #10 on: November 21, 2022, 21:25:06 »
Hey no Saurman
   I replaced my leaky OEM pump with a non OEM pump from Buds Benz ($725 usd).  Fits perfect, quieter than OEM   and still working well after a year.
https://www.budsbenz.com/catalog/230-250-280-sl/d-fuel/D205-010

Waiting on rebuild kit ( Q? Authentic Classics?) and will rebuild original fuel pump as a spare….winter project

roymil

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Re: fuel pump
« Reply #11 on: November 21, 2022, 22:45:21 »
For a temporary pump, while I worked on my short pump rebuild, I also installed a Carter P4601HP, just like Tycoon in the earlier post.  I agree with Tycoon that it is cheap and does work but it is loud and has an inconsistent noise, because its speed doesn't sound constant.   I've have also only been measuring ~11psi, sometimes lower with low rpm and lower voltage from alternator.   My theory is that the Carter pump needs a regulator or return flow constrictor to get the pressure up near 15psi where it should be, regardless of voltage.   Once I sort that out i'll reinstall the original pump and keep the Carter as a spare...which will undoubtedly be needed at some point.    I'm going to try leaving the regulator in with the original pump an see if that stabilizes pressure better.
Mark Miller
1968 280SL
Rode in his pagoda's first mile.

stickandrudderman

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Re: fuel pump
« Reply #12 on: November 22, 2022, 09:27:00 »
Link modified.

David Robinson

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Re: fuel pump
« Reply #13 on: November 22, 2022, 11:00:18 »
I fitted "Hi OTP017 Out-Tank Fuel Pump o/e:- 0580464070" with a hi flow pre filter when mine failed 2 years ago. Still fitted and works fine. A little loud when stationary or low revs. But both together only cost around €110.

jim 56

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Re: fuel pump
« Reply #14 on: November 23, 2022, 14:28:50 »
I really doubt magnets are no good. Yes check impellar is not upside down. I think if I remember correctly that if you put the can on with the magnets 180 degrees out it will run backwards. Yes Baron does do short pumps the man knows soooo much about them very friendly called him years ago and really helped me.

Pinder

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Re: fuel pump
« Reply #15 on: November 24, 2022, 19:26:20 »
If you got the magnets 180 degrees out try switch Plus and Minus. it should run the opposite direction and see if you get flow.  Ive never seen a magnet lose strength.
1970 280 SL Light Ivory DB 670. 4 Speed manual shift no AC Limited Slip Diff.

franjo_66

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Re: fuel pump
« Reply #16 on: November 24, 2022, 23:54:53 »
Hi Stick

I found these specs for the Holley, seems like max pressure of 7psi is not sufficient for our cars?

Free Flow Rate                       97 gph
Maximum Pressure (psi)       7 psi
Inlet Size                              3/8 in. NPT
Inlet Quantity                      Single
Inlet Attachment              Female threads
Outlet Size                      3/8 in. NPT
Outlet Quantity                      Single
Outlet Attachment              Female threads
Franjo

1965 230SL Black/Auto/RHD
2005 Porsche Cayenne Turbo
1983 BMW 735i
1986 560 SEC
1991 500SL
1982 Holden Statesman DeVille

stickandrudderman

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Re: fuel pump
« Reply #17 on: November 25, 2022, 08:57:13 »
There's several different versions, one of which generates 14psi.