Mark:
The fuel pressure must be somewhere in the 3-5 psi range or you will
lift the carb. inlet valves.
Most pumps prefer to push fuel, not pull. The pump is mounted as
low and close to the tank as possible to allow a gravity feed to the inlet.
Earlier vehicles such as T's and M Minors run a low pressure suction pump on
the firewall, but have a much lower flow rate than the later cars.
Hope this helps.
Kelvin Dodd (so many cars so little time)
58 MGA X2 in bits
58 MG Magnette ZB
65 MGB Works Replica
66 Jaguar 3.8S
68 MGB GT V6
73 MGB GT
78 MGB V8 in process
> -----Original Message-----
> From: Jones, Mark [mailto:MJones@ngl.ca]
> Sent: Monday, February 01, 1999 7:54 AM
> To: 'mgs@autox.team.net'
> Subject: Fuel pump question
>
>
> I posted a question earlier to this group concerning the SU
> AUF204 fuel pump
> I found on my car. It turns out this is a Midget fuel pump
> (thanks for all
> the responses) and is probably unable to provide enough fuel
> under "spirited
> driving condition".
>
> I know have a few more questions:
>
> - If I decide not to use a proper SU what do I have to be
> concerned about
> when using a generic replacement pump? Does too high a
> pumping pressure
> affect the carburetors?
>
> - Why was the fuel pump put under the car rather than in the engine
> compartment? Could it be repositioned to the engine compartment? I'm
> guessing that the answer here is that you would be concerned
> about vapour
> looking of the pump but is there any other reason?
>
> Any help is greatly appreciated. Gotta love the list!
>
> Mark
> 73 B GT
>
|