fuel pump issues

[Ryan81]

my mg maestro rally car keeps chewing up fuel pumps for some reason , (not while i have had it )

i dont want to have to retire from a rally due to this , so looking to buy and uprated bosch one , that my cossie has ,

but i`am unsure of what flow rate / rating etc would be suitable for my 2. efi

[Russ]

Sounds like the pick up pipe in the tank maybe restricted, I lost 2 due to the pipe being furred up becouse of supermarket petrol. I had it steam cleaned and fitted a bosch pump and touching wood have had no problems since

[E_T_V]

What voltage are you running the pumps at? If its and EFI then the voltage varies between 9 and 12v depending on driving condition. If the relay that controls this is broke then it could be that rather than the pump that is going faulty. Otherwise a blocked pickup is also a possibility.

Remember that the same pump on the EFI is used for the turbo (permenantly at 12v), which is more than up to the job if everything else is healthy.

[mgdavid]

surely the other way round Dan? - turbo runs at 9v 'cos it only needs a max of 18psi whereas the Efi needs 60psi for the injectors so runs at 12v all the time.

[E_T_V]

I don't think it is, hence the extra relays in the EFI models.

The turbo needs the extra flow and hence the extra voltage.

[mgdavid]

you're right of course, legacy EPC states
DRC3017 - Resistance, ballast - fuel pump - EFI
(but I still don't understand the logic of how it works compared to the turbo)

[E_T_V]

I think you have to ignore the pressure and think of litres per hour.

The Turbo will certainly use more of them :)