[ROVERNET - UK] Fuel Pump woes

S Manwell smanwell at sprintmail.com
Tue Aug 2 12:14:52 BST 2005


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 


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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