Anemic Stock Fuel Pump???
12-01-2018, 02:13 PM
#1
Anemic Stock Fuel Pump???
Hi all. I'm in the process of getting my 1.7T back on the road.
I figured I'd check the injectors before I bolt up the intake manifold. I jumpered at the main relay to turn on the fuel pump, then applied 8.5V to each injector for 15s to turn them on, one at a time.
I ran a hose from the fuel pressure regulator to a gerry can for the extra bypassed fuel.
I found that in 15s I injected approx 100mL. They were matched +-5ml which made me happy. A little low for the quoted injector size (500) but 400 is in the ballpark at least.
Without the injector firing I noticed the output from the regulator was surprisingly weak. A trickle. I measured this at 250mL/30sec, multiplying out to 500mL/min, 30L/Hour.
When I turned on the injector the bypassed fuel all but stopped.
Is this normal for a stock pump? Should be 130LPH right?
Chay
I figured I'd check the injectors before I bolt up the intake manifold. I jumpered at the main relay to turn on the fuel pump, then applied 8.5V to each injector for 15s to turn them on, one at a time.
I ran a hose from the fuel pressure regulator to a gerry can for the extra bypassed fuel.
I found that in 15s I injected approx 100mL. They were matched +-5ml which made me happy. A little low for the quoted injector size (500) but 400 is in the ballpark at least.
Without the injector firing I noticed the output from the regulator was surprisingly weak. A trickle. I measured this at 250mL/30sec, multiplying out to 500mL/min, 30L/Hour.
When I turned on the injector the bypassed fuel all but stopped.
Is this normal for a stock pump? Should be 130LPH right?
Chay
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