Dino 2400 Coupe -71

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Dino: Fiat Dino 2.4 Coupe
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Re: Dino 2400 Coupe -71

Post by Tobi » Mon Nov 30, 2020 8:14 am

dinoverde wrote:
Sun Nov 29, 2020 7:35 pm
on the dino..the fuel pump should not be eared when the ignition is turned on(unless the wiring was modified)
there is a sensor on your oil filter housing that measure oil pressure after rotating the engine with the starter.. when that pressure is high enough the oil pump kicks in.. This is to insure enough oil pressure to the cams on start up..If your car seats a lot , it will take a few seconds of cranking for the fuel pump to get the signal(ground).. Having a strong starter is imperative ..
During cranking, the fuel pump is supplied by the ignition key switch. After cranking, it is supplied by the relay that needs oil pressure to supply the pump. More info on this: viewtopic.php?f=4&t=1049&p=4865
The reason why it takes a bit longer to start a car that hasn't been driven for a while is that the carbs must be primed. It's best to turn on ignition, listen to the pump supplying fuel to the carbs, kick down the pedal a few times to open the throttle valves and start to crank after a few seconds.

Luis A
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Dino: Fiat Dino 2.4 Coupe

Re: Dino 2400 Coupe -71

Post by Luis A » Mon Nov 30, 2020 6:48 pm

I have found that if you very slowly turn the key toward the start position the fuel pump and the vacuum pump will come on before the car starts, it's very, very close to the start position but just before it. Serves to fill up the carb bowls without having to crank the engine for long.

My feeling is that oil pressure-fuel pump interlocks are generally done with safety in mind thus avoiding a situation with an engine that stops running (accident) but the electric fuel pump continues to pump.

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