Fuel Pump Queiry...?

[RTHRTY3]

How do u diagnose (spelling) your fuel pump, like preasure testing or something, and without testing it on the dyno.

Cheers guys.

[The Dan]

You have to do a flow test by seeing how many litres per hour the pump is pumping. Disconnect the fuel line into the rail, and then somehow apply 12v directly to the pump wires. I don't wanna tell you to get a 12v battery and use bare wires in your boot coz knowing my luck you'd blow yourself up and I'd get sued. So I'm not telling you to do that. But however you want to do it, you have to apply a direct 12v to the pump. It won't get an accurate reading from just cranking as after the initial prime the pumps speed slows to half as current is drawn to the starter so the pump doesn't get a full twelve volts.

You have to catch the fuel into a 2 litre milk container or something of that sort. Also I recommend the use of an approved fuel container but once again it's entirely up to you.

Posts your results here and I'll tell you what they mean. You basically have to work out how many litres per minute or litres per hour. So this means you have to time it. Two people are generally needed for this.

A fuel pressure test can really only be done with a fuel pressure guage. You won't need to test pressure while driving if the flow test comes up ok.

Really all you need to achieve both tests is a fuel pressure guage and a 2L milk bottle.