frustrating fuel pressure issue

[joshuaho96]

35 minutes ago, damnonrs said:

i will hard wire it for now until my problems are resolved and get it dyno tuned again. i'm just worried about fuel temperature running the pump at 100%, is that a problem or its ok to just have it on full blast at all times

It's fine, main concern with a big pump is you overwhelm the pressure regulator but if you fit an aftermarket high flow one it shouldn't be a problem until you're really flowing a ton of fuel.

[BK]

20 minutes ago, joshuaho96 said:

It's fine, main concern with a big pump is you overwhelm the pressure regulator but if you fit an aftermarket high flow one it shouldn't be a problem until you're really flowing a ton of fuel.

An 044 or 340 is generally not big enough to stuff around with a properly working stock fuel regulator, but his reg looks pretty suspect and need of replacement anyway.

[damnonrs]

so i spoke to my tuner, and he said he just changed the wiring that goes from the battery to the pump, the line in the fuel tank and the wiring in the fuel tank is still OEM at like 22 gauge or whatever it is. is that essential to upgrade or would that restrict the voltage?

[Dose Pipe Sutututu]

Yes

[joshuaho96]

15 hours ago, damnonrs said:

so i spoke to my tuner, and he said he just changed the wiring that goes from the battery to the pump, the line in the fuel tank and the wiring in the fuel tank is still OEM at like 22 gauge or whatever it is. is that essential to upgrade or would that restrict the voltage?

The shorter the wiring run the less resistance there is but you'd have to actually measure the voltage drop to be sure. If you've confirmed that the fuel pump is running at 100% flow all the time then your problem is almost certainly related to the regulator then. Every other part of the system is running like it would be at full throttle.

[damnonrs]

finally fixed this issue and was able to get my 2.8 fully tuned, the car is an animal now! pretty much the issue was a bad fuel pump relay 😆, hence the fuel pump pressure dropping with load

[Predator1]

On 07/12/2022 at 4:46 PM, GTSBoy said:

Just hang the ambient air temp sensor over the top of the exhaust manifold, f'rigsample.

Or change the barometric pressure to sea level, like a popular old North Auckland Tuner does as well.