What does Ecutek variable “Fuel Rail Pressure MPA” represent (no startup)? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Eazy-V · 05-04-2022, 04:52 AM

My FRS currently is cranking but not starting, so here are 2 datalogs

CURRENT (cranking with no startup): https://datazap.me/u/eazy-v/2013-frs...g=0&data=12-17

2018 (startup fine): https://datazap.me/u/eazy-v/2013-frs...g=0&data=12-17

Any ideas of what might wrong?

steve99 · 05-04-2022, 05:49 AM

Fuel rail pressure monitored is the DI fuel rail pressure.

unlike fhe port injection pump in tank that is regulated to aprox 60psi constant, the di fuel rail pressure is variable and controlled the the DI computer and engine ecu to vary the di fuel rail pressure depending on di demand, the di system manages both pressure and injectpr pulse width to deliver required amount of fuel

steve99 · 05-04-2022, 05:51 AM

These cars start on 100% port injection

but ensure all bolts are in and tight on DI computer on side of engine

Eazy-V · 05-04-2022, 02:36 PM

Quote:

Originally Posted by steve99

These cars start on 100% port injection

but ensure all bolts are in and tight on DI computer on side of engine

Ok I’ll check that

So, would this indicate that the in-tank fuel pump has to be working since it would be sending fuel up to the DI pump? Or is the DI pump on a separate fuel line to the gas tank?

steve99 · 05-05-2022, 07:04 AM

Quote:

Originally Posted by Eazy-V

Ok I’ll check that

So, would this indicate that the in-tank fuel pump has to be working since it would be sending fuel up to the DI pump? Or is the DI pump on a separate fuel line to the gas tank?

there is no monitoring on the in tank low pressure pump you would need to T into fuel line and measurecfuel pressure should be round 60 psi.

The di pump is mechanical pump fed from intank pump but im pretty sure it will just draw fuel through the in tank pump even if its low pressure or bot working

blsfrs · 05-05-2022, 11:01 AM

Can you give it a little squirt of starter fluid? If it "tries" to start you then know it's a fuel problem. If not then check your Flux Capacitor.

Eazy-V · 05-20-2022, 08:54 AM

Got it resolved, found that the inline fuse on my Deatschwerks fuel pump hardwire kit was completely melted

DarkPira7e · 05-20-2022, 09:11 AM

Quote:

Originally Posted by Eazy-V

fuel pump hardwire kit

That's a sign that something is terribly wrong, I would figure that out before hardwiring again.

05-04-2022, 04:52 AM	#1
Eazy-V Senior Member Join Date: Mar 2013 Drives: 2013 Scion FR-S Whiteout Location: Vancouver, BC Posts: 137 Thanks: 9 Thanked 6 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	What does Ecutek variable “Fuel Rail Pressure MPA” represent (no startup)? My FRS currently is cranking but not starting, so here are 2 datalogs CURRENT (cranking with no startup): https://datazap.me/u/eazy-v/2013-frs...g=0&data=12-17 2018 (startup fine): https://datazap.me/u/eazy-v/2013-frs...g=0&data=12-17 Any ideas of what might wrong? __________________ FBM Base Turbo Kit with GTX2867R and FlexFuel Kit with Walbro 485 / 550cc Injectors EcuTek Tuned witih Greddy Profec @ 12PSI Shell 91-E73 and 18PSI E73 1993 Mazda MX6 N/A Fully Built on MegaSquirt (work in progress) 2023 Chevrolet Corvette Z51 Stock

05-20-2022, 08:54 AM	#7
Eazy-V Senior Member Join Date: Mar 2013 Drives: 2013 Scion FR-S Whiteout Location: Vancouver, BC Posts: 137 Thanks: 9 Thanked 6 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Got it resolved, found that the inline fuse on my Deatschwerks fuel pump hardwire kit was completely melted __________________ FBM Base Turbo Kit with GTX2867R and FlexFuel Kit with Walbro 485 / 550cc Injectors EcuTek Tuned witih Greddy Profec @ 12PSI Shell 91-E73 and 18PSI E73 1993 Mazda MX6 N/A Fully Built on MegaSquirt (work in progress) 2023 Chevrolet Corvette Z51 Stock

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05-04-2022, 05:49 AM	#2
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,998 Thanks: 1,035 Thanked 4,987 Times in 2,981 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	Fuel rail pressure monitored is the DI fuel rail pressure. unlike fhe port injection pump in tank that is regulated to aprox 60psi constant, the di fuel rail pressure is variable and controlled the the DI computer and engine ecu to vary the di fuel rail pressure depending on di demand, the di system manages both pressure and injectpr pulse width to deliver required amount of fuel

05-04-2022, 05:51 AM	#3
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,998 Thanks: 1,035 Thanked 4,987 Times in 2,981 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	These cars start on 100% port injection but ensure all bolts are in and tight on DI computer on side of engine

05-05-2022, 11:01 AM	#6
blsfrs Senior Member Join Date: Dec 2018 Drives: 2013 frs base Location: central Virginia Posts: 1,121 Thanks: 1,745 Thanked 941 Times in 480 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	Can you give it a little squirt of starter fluid? If it "tries" to start you then know it's a fuel problem. If not then check your Flux Capacitor.

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