Turbo and Walbro 485 Fuel Pump

[FRS Justin]

Also check for leaks where pump is connected

[BrightSlide]

Originally Posted by BRX

I used to run 20 psi on my 10.5:1 FA20 with a DW 300c pump and 1050x injectors and it had room for more. I was never able to get the Walbro working properly as it kept running out of fuel at about 1/3 of the tank but when it had fuel in it, it would run fine. I don't think it's a fuel pump issue.


I had 850 injectors before and no matter what my tuner wasn't able to dial them in. Went with the new ID1050x injectors and we dialed them in in a handful of revisions.

What is a hand full?
I am on revision 14 or 15 since changing swapping int the 1050x’s, deleting the BOV, correcting the EBC (apparently one of the nipples is supposed to vent to atmosphere it was previously covered)
Idle is now totally normal but the car will intermittently lean out under boost or low vacuum conditions
Tuner is saying the engine is not taking the timing it should for the compression as if it is acting like a 12.5;1 instead of the 10.0:1 that it is

Checking spark plugs, high compression test, timing computer thing and O2 sensors tmw to see if something else is a mis

[BRX]

Originally Posted by elliotfrs

What is a hand full?
I am on revision 14 or 15 since changing swapping int the 1050x’s, deleting the BOV, correcting the EBC (apparently one of the nipples is supposed to vent to atmosphere it was previously covered)
Idle is now totally normal but the car will intermittently lean out under boost or low vacuum conditions
Tuner is saying the engine is not taking the timing it should for the compression as if it is acting like a 12.5;1 instead of the 10.0:1 that it is

Checking spark plugs, high compression test, timing computer thing and O2 sensors tmw to see if something else is a mis

With the 850s I had +100 revisions but it was always super rich up top.

When I swapped them to the 1050x we had it running perfect in 5-6 revisions if I remember correctly.

Not sure what's causing your problem but I don't think it's the injectors or fuel pump.

Sent from my Pixel 2 XL using Tapatalk

[Hags86]

Originally Posted by elliotfrs

Hey i am having similar issue as OP
After about 5.5k rpm (making around 8-12psi there and peaking 16-17psi WOT redline)
the car leans out abruptly and tuner thinks it is due to fuel lack of fuel pressure
I tested fuel pressure before bc another tuner suspected it previously to be the cause of a rough idle but it checked out fine at idle and with stationary throttle input

If it was a fuel pressure pump instal error wouldn’t it b all the time?

Install a fuel pressure gauge. Even just a temporary install by making short extension hose and a quick connect in at the fuel pump or the engine bay. A simple mechanical gauge, a bit of hose and two quick connects and you'll know for sure if that is the issue or if you can rule it out.

(P.S..I love.my Motec install. Having all this data logged is priceless when it comes to trouble shooting)