AMS explores the Gen Coupe fuel system (2.0T) - Genesis Forum: GenCoupe Hyundai Genesis Coupe Forums

GenX · 03-26-2009, 05:19 PM

I got the Coupe in the shop today and dissected the fuel system.

Access to the fuel pump is quite easy. Removing the bottom portion of the back seat will reveal the two cover plates for accessing the fuel tank. Under the drivers side is where you find the fuel pump.

After disconnecting the electrical connector and two quick connect fuel lines, you remove eight bolts for the hold down ring and the fuel sending unit lifts right out.

This is where the magic happens. Inside this fuel sending unit is the fuel pump, fuel pressure regulator and and also doubles as a surge tank. The outside houses one of the two fuel level senders. One other feature of the fuel sending unit is the siphon. Let me explain this really quick....

The fuel tank has a hump in the center for drive shaft clearance which basically splits the tank into two sections. This is what is known as a "saddle tank". Because of the "saddle" design of the tank, a fuel transfer tube is needed to keep fuel on the side of the tank that the fuel pump is on. The passenger side has a pick up tube and the drivers side has a siphon. There is a transfer tube that runs along the top of the tank between the two sides. Inside the fuel sending unit, there is a siphon which is connected to the outlet of the fuel pressure regulator. The fuel returning back into the sending unit runs through the siphon T which creates a siphon pulling fuel from the passenger side to the drivers side. If this system was not there, you would run out of gas at a little under half a tank because all your fuel would be on the passenger side with no way to get to the fuel pump.

I was able to disassemble the fuel sending unit and pull the fuel pump out and get it into our test rig. Got some GREAT news there. Here is a chart that shows flow versus pressure of the Coupe's fuel pump versus other pumps we have flowed.

All of the fuel pump tests we do are at 14V DC. Flow is measured by a digital flow meter after being regulated by an Aeromotive adjustable fuel pressure regulator. Pressure is monitored by a liquid filled 0-100 psi pressure gauge.

As you can see by the chart, the Coupe's fuel pump is pretty stout. The graph lays exactly over the Evo 9 fuel pump's graph. On an Evo 9, we do not recommend an upgraded fuel pump till the turbo is upgraded!

I investigated fitment for a Walbro fuel pump and we happen to have a perfect fit in stock. The Walbro is just a tick longer than the stock pump so the rubber isolator on the bottom will need to be trimmed or deleted for fitment. The factory electrical connector plugs right into the Walbro. This is going to make upgrading the fuel pump very easy.

I got with engineering and they have already designed a trick little part for the sending unit that will enable us to run a boost compensating fuel pressure regulator in the engine compartment and a return line back to the sending unit. It will still use the factory siphon so there will be no issues with prematurely running low on fuel.

After getting the fuel system back together, the last step was to check voltage at the pump. Some newer systems have voltage regulators for adjusting pump flow and pressure. The Coupe does not regulate voltage at all. There is a constant 13.5ish voltage at the pump.

There are a couple more things that I want to look at in the fuel system (fuel pressure, injectors etc..) and I will update this thread when I have that information.

AdR · 03-26-2009, 05:31 PM

Very nice, I think you stated earlier that the fuel system had no return line so that part you're talking about will add the return line to the fuel system right?

KDMGUY · 03-26-2009, 05:32 PM

What type of fuel pump did stock have for replacing with Walbro? My guess is GSS342 just like the EVO and New Tiburon?

ed3cjd · 03-26-2009, 05:35 PM

2.0T's fuel economy is great.
i am not recommend change its fuel system.

*Mitsubishi Lancer Evolution fuel economy : 16 / 22 mpg
*Genesis Coupe 2.0t fuel economy : 21 / 30 mpg

GenX · 03-26-2009, 05:41 PM

Quote:

Originally Posted by KDMGUY

What type of fuel pump did stock have for replacing with Walbro? My guess is GSS342 just like the EVO and New Tiburon?

While I am providing a lot of information for everybody, I do not think AMS would appreciate me doing the leg work for the other vendors here. Some things I have to keep on the down low.

AdR · 03-26-2009, 05:48 PM

Quote:

Originally Posted by ed3cjd

2.0T's fuel economy is great.
i am not recommend change its fuel system.

*Mitsubishi Lancer Evolution fuel economy : 16 / 22 mpg
*Genesis Coupe 2.0t fuel economy : 21 / 30 mpg

If you're keeping the car stock I am certain nobody would recommend changing the fuel system. But if you want to upgrade the turbo setup a fuel system upgrade IS needed to maintain the reliability of the engine. Most of those who will tune the car won't be too concerned for fuel economy if not we'd just leave the car as is.

KDMGUY · 03-26-2009, 06:16 PM

Quote:

Originally Posted by GenX

While I am providing a lot of information for everybody, I do not think AMS would appreciate me doing the leg work for the other vendors here. Some things I have to keep on the down low.

I guess we will have to pull one out from our cars and find out then I guess

We just became one of your dealer to carry your future products tho!

cant_stop_spinning · 03-26-2009, 06:35 PM

alright i have a really important question:

i'm selling the returnline to my SRT-4 tomorrow, it includes an aeromotive 1-1 FPR. Should i keep it? Or will a walboro alone be able to sustain a modified stock/bigger turbo?

GenX · 03-26-2009, 06:39 PM

Quote:

Originally Posted by KDMGUY

I guess we will have to pull one out from our cars and find out then I guess

We just became one of your dealer to carry your future products tho!

Eric is the sales manager and the gentleman that set up your account. You can give him a call and I am sure he would share this info with you. I unfortunately do not have a say in what information I can and can not post. I am sorry.

For what it is worth, I was not specifically referring to you and your company but to all vendors in general. I am sure that other vendors are gaining a lot of valuable information from the posts I have been making. I am happy to share, but ultimately, it is AMS that makes the calls on what gets posted.

GenX · 03-26-2009, 06:43 PM

Quote:

Originally Posted by cant_stop_spinning

alright i have a really important question:

i'm selling the returnline to my SRT-4 tomorrow, it includes an aeromotive 1-1 FPR. Should i keep it? Or will a walboro alone be able to sustain a modified stock/bigger turbo?

The only thing that would probably cross over to the GC would be the FPR. The return line may not be the right length and the adapters and fittings you need may not be the same. Most of the SRT-4 kits I have seen dump the fuel back into the fill neck which is not the correct way to do things. On the GC, you will need to put fuel back through the sending unit and have it plumbed through the factory siphon. This is going to require custom pieces.

cant_stop_spinning · 03-26-2009, 06:57 PM

Quote:

Originally Posted by GenX

The only thing that would probably cross over to the GC would be the FPR. The return line may not be the right length and the adapters and fittings you need may not be the same. Most of the SRT-4 kits I have seen dump the fuel back into the fill neck which is not the correct way to do things. On the GC, you will need to put fuel back through the sending unit and have it plumbed through the factory siphon. This is going to require custom pieces.

Thanks!! i figured the only thing i could keep would be the aeromotive, but i'm just gonna part it out with the rest of the stuff and wait for your guys kit :biggthumpup:

econorocket · 03-26-2009, 07:14 PM

Have you addressed the injectors yet? Specifically have you found the correct size replacements at least?

GenX · 03-26-2009, 07:20 PM

Quote:

Originally Posted by econorocket

Have you addressed the injectors yet? Specifically have you found the correct size replacements at least?

Yes, this is already done. Injectors are not an issue. Tuning for the injectors is what we are waiting on.

We have a couple more fuel related components in the works including a billet fuel rail. When we are a bit closer, I will update the thread with all the goodies.

McFly · 03-26-2009, 08:59 PM

Nice work. Did you pump out that regular fuel while you were in there, so that you could dyno with some premium? Hope so.

GenX · 03-27-2009, 05:15 AM

I will have 93 numbers by Monday for sure. This thing just gets really good gas mileage!!!

Golfa · 03-27-2009, 05:21 PM

Quote:

Originally Posted by GenX

I will have 93 numbers by Monday for sure. This thing just gets really good gas mileage!!!

I'll be anxiously awaiting those

**Tom@G&M** · 07-22-2009, 08:30 PM

Anything new to report, GenX?

theironmonk · 07-23-2009, 08:42 AM

I have a feeling that they blew there engine with there turbo kit and scrapped there R&D

**N2OInferno** · 07-23-2009, 09:33 AM

Considering the turbo kit is still on their website with an ETA of Christmas 2009, they're probably still working on it. Most tuner shops are extremely busy during the summer.

CALIBAN · 07-25-2009, 01:17 PM

Very informative. Thank you!

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