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Testing a SU fuel pump?


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5 replies to this topic

#1 bobfogle

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Posted 13 August 2010 - 10:00 PM

Hi Guys:
How do you test the SU fuel pump from an S1 Esprit (116H)? Mine doesn't seem to respond.
Is there a electric fuel pump replacement you guys might recommend? (I'm in the US)
Thanks in advance for your help.
Bob

#2 andydclements

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Posted 14 August 2010 - 08:09 AM

A failed SU pump is normally just the points being pitted/ seized.
The rubber cap comes off the end, you'll find a contact breaker system that results in the loss of electrical flow when the plunger/ shaft is nearly at full throw, so the plunger/ shaft returns to the other end, and electrical power is restored and it cycles again. The plunger/shaft is attached to a diaphragm, so fuel is moved, and by the use of two one-way valves it only moves in one direction.

You can simply purchase new points for the pump, set it up per the manual and away you go.

Yes there are alternatives.

1) a non-points based hall effect system that fits the original pump
2) a non-SU pump

Look for kits fitted to old BL cars as upgrades as options for you.

Andy

#3 molemot

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Posted 14 August 2010 - 08:29 AM

Moss Europe sell hall effect electronic replacements for SU points...you can even get ones that "tick" like the original! I would certainly use one of these kits...the original SU setup was always a bit parlous. The electronic ones fit right in and the conversion is easy.

Scientists investigate that which already is; Engineers create that which has never been." - Albert Einstein

#4 Mesprit87

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Posted 16 August 2010 - 11:15 PM

You can also try these guys:

http://www.burlen.co.uk/

Luc
Something I learned about cars or planes, it all works until it doesn't anymore...sometime there is no way around it!

#5 77 esprit

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Posted 04 February 2011 - 03:30 PM

Hi Guys:
How do you test the SU fuel pump from an S1 Esprit (116H)? Mine doesn't seem to respond.
Is there a electric fuel pump replacement you guys might recommend? (I'm in the US)
Thanks in advance for your help.
Bob



Bob,

Just saw this post. Must be wasting too much time elsewhere. Rebuild the pump electrics! I have three pumps. One installed. One in the parts kit under the front bonnet. One in my garage. Learned the hard way. Just clean the points. Might take you an hour. There is a how to in the S1 service manual. I'll send you a copy if necessary.

Lyn

#6 bobfogle

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Posted 04 February 2011 - 04:17 PM

Lyn:
Yes, indeed. Thanks for you reply.
I did just that and everything is working fine. I finally had remembered my experiences with the SU fuel pump on my MG TC in the 50's.
Same problem, same solution - just clean the points. Thanks for keeping me in mind.
Regards,
Bob




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