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teg1992 12-01-2018 02:07 AM

Stock Fuel Pump Problem??
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? I guess the next step is to check the filter. Not long ago I checked it and it was fine...I don't have a great way to check fuel it doesn't have a fuel rail test port like a GM/Ford. They did one thing right lol.


Built_not_bought 12-01-2018 11:28 AM

You don't have to have a gauge-friendly fuel rail. You can install fuel pressure gauge directly onto the fuel filter. The hood will still close.

teg1992 12-01-2018 06:10 PM

Yeah thanks. I read about that. I'll have to pick up an adapter for the fuel filter.


teg1992 01-08-2019 06:36 PM

I was able to rig up a fuel pressure guage on the filter. I changed out to a Walbro 255. The fuel pressure, with no other changes, went from 40 psi to 50psi. I have lots of fuel bypassing the reg now.

Looks like the old pump was near dead!


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