Wiring in a fuel pump kill switch. Low oil pressure when starting.

[AGB]

Hi Peeps,

My oil pump kicks out healthy oil pressure when the car is running but I notice it takes a second or two before it builds up once the car starts. I would like the ability to start (crank) the engine with the fuel pump off to give the engine a chance to build up some oil pressure before it fires.

 

I would like to wire in a switch to the current fuel system. I don't really want to buy a heavey duty high current switch and tap into the main pump power feeds but I was wondering if the lower current FPC signal wire for the Fuel pump ECU would do the trick? If FPC wire is switched "off" would the fuel pump ECU not send voltage to the fuel pump? Or will this not work?

 

I completely realise that this is masking the issue of low oil pressure on startup, but this will be a temporary measure till I can afford to pull the engine and replace pump and check bearings and all other internals.

 

Thanks for reading.

[Chris Wilson]

The system SHOULD retain fuel pressure for a LONG time after engine switch off, you need to use the oil pressure switch to disable the ignition to ensure a no start until oil pressure trips the oil pressure switch.

[AGB]

Thanks for the reply Chris.

 

I have no clue how to design an ignition cut using oil pressure switch . I was hoping it would be as easy as turning the key and cranking for five or six seconds and then throw a switch to activate the fuel pump so the engine can fire with sufficient oil pressure present.

 

I'll keep researching.

 

cheers,

Alan.