|Topic Review (Newest First)|
|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!
|12-01-2018 06:10 PM|
Yeah thanks. I read about that. I'll have to pick up an adapter for the fuel filter.
|12-01-2018 11:28 AM|
|Built_not_bought||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.|
|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 pressure...sucks it doesn't have a fuel rail test port like a GM/Ford. They did one thing right lol.