[ROVERNET - UK] Fuel Pump woes

[Slatskars]

I have a problem with Facet type pumps. They run constantly and I do not 
like the noise. I finally switched the MGB that had one back to SU. Much 
quieter.

Slats
----- Original Message ----- 
From: "S Manwell" <smanwell at sprintmail.com>
To: <lacpsyd at earthlink.net>; <rovernet at lyris.ccdata.com>
Sent: Tuesday, August 02, 2005 4:14 AM
Subject: Re: [ROVERNET - UK] Fuel Pump woes


> Lance,
>
> I'm not too familiar with 3500S specifics, but I think the Federal 3500S 
> may have had a US-made Facet electric fuel pump.  I think you might be 
> able to get the same pump at a NAPA autoparts store or similar.  Also, I 
> wonder if there is any restriction in the straw that the pump is sucking 
> from...
>
> --Steve
>
> Lance La Certe wrote:
>
>>Hi Gang,
>>
>>Need help with fuel pump and discovered some info that may be helpful to
>>others on the list.
>>
>>1) 1970 3500S ----I'm in need of a new fuel pump.  Any suggestions for a
>>state-side source (I will be contacting Ruth Burgess in Canada)
>>
>>2) I need to know if anyone can give me the specs on the OEM fuel
>>pump----specifically what are the upper and lower pressure limits (e.g.,
>>2.5 psi to 4.5 psi, etc).
>>
>>3) For several months I have struggled with the car not being able to idle
>>once the engine was at normal operating temperatures (especially in the
>>summer when it has become especially hot).  After many helpful suggestions
>>from the listers (e.g. blow out the return fuel lines; check the
>>circulating coolant line which runs directly into the intake manifold;
>>check your timing, etc)-----I discovered that when cold and just starting
>>that my fuel pump was putting out only about 3 psi-----this was adequate 
>>to
>>keep things running smoothly, but after several minutes of running, as the
>>fuel pump becomes warm it actually becomes less efficient (apparently most
>>all fuel pumps operate this way----hence the listed range on the specs). 
>>As it turns out, when warm (and this has nothing to do with the engine
>>temperature, but the pump temperature), it was only putting out 1 psi.  At
>>this pressure there is not enough flow into the carb bowls to overcome the
>>tendency for the gas to vaporize, especially when the engine is warm/hot. 
>>With a properly operating pump which is keeping the pressure up, it should
>>overcome the tendency to vaporize and allow the engine to continue to 
>>idle.
>>
>>
>>4) My mechanic is suggesting that I find a pump that will put out about 7
>>psi when cold, so that when it heats up it will still be putting out about
>>3 psi to overcome the vaporizing problems.
>>
>>Any help with this would be appreciated.
>>
>>Lance La Certe,  Denver, CO
>>
>>
>>Lance La Certe
>>lacpsyd at earthlink.net
>>
>>
>>
>>
>>
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>>
>
>
>
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