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Discussion Starter #1
My 2011 has just over 27K miles on it. On Saturday the Check Engine light came on. The next time I started the car, it cranked over for about 5 seconds before starting, which is unusual. Then multiple times Sunday and this morning, it seemed to take even longer to crank before starting. This morning, it barely would stay running. And there was a lot of hesitation driving down the road.

I scanned it with my OBD II scanner and got P0087 (Fuel Rail/System Pressure Low). I dropped it off at the dealer this morning and jut got a call that they are replacing the High Pressure Fuel Pump. But they had to special order it overnight and probably won't have it replaced for another day after that.

Has anyone else experienced this failure? Is it common? I couldn't find anything when I did a YF forum search.

Is the high pressure fuel pump the device sticking out the top of the valve cover on the back, driver side of the valve cover, with the multiple fuel lines going into/out of it?
 

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Discussion Starter #3
I figured there was a typical electric pump and filter in the tank. But there's no way that pump will supply the 2,000+ psi the GDI system needs to function. And I read somewhere else on this forum how the Theta engine has a second pump on top of the engine for generating the high pressure fuel needed for the GDI system. I also saw a Theta engine video someone posted here that shows what looks like a mechanical fuel pump running off the top of the rear camshaft that was connected to the injectors. I'm trying to put the pieces together with the tidbits of information I've found so far.
 

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I figured there was a typical electric pump and filter in the tank. But there's no way that pump will supply the 2,000+ psi the GDI system needs to function. And I read somewhere else on this forum how the Theta engine has a second pump on top of the engine for generating the high pressure fuel needed for the GDI system. I also saw a Theta engine video someone posted here that shows what looks like a mechanical fuel pump running off the top of the rear camshaft that was connected to the injectors. I'm trying to put the pieces together with the tidbits of information I've found so far.
I think you are in the right place. GDI is like a diesel engine - two fuel pumps - one to circulate out of the tank, one to pressurize the fuel rails so that fuel can be injected into a compressed cylinder. The high-pressure pump is on top of the engine.
 

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Discussion Starter #5
Here is a link to the post with the video I was referring to:

Theta motor

Go down to post #5. It clearly shows a mechanical pump driven off the exhaust cam that is generating the high pressure for the injectors.
 

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Discussion Starter #6
I guess this isn't very common since nobody has responded. Who has had a failed fuel pump in the tank (lift pump) or clogged fuel filters in the tank? Are either of these common?

Even though the dealer claims the high pressure pump has failed, I am suspicious of the lift pump or filter in the tank. If they can't supply enough fuel to the high pressure pump, then the HPP can't generate enough flow and pressure. We'll see how the fix goes. In the meantime I get to drive a very stylish Ford Focus.
 

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I think I read on here not long ago where someone had their fuel pump (in tank) replaced.
 

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Discussion Starter #9 (Edited)
I did see that one but the impression I got was that the starter lever was the problem and they just replaced the high pressure pump for good measure. Maybe with a no-start condition it's standard to replace the starter lever and test the high pressure pump, which failed the pressure test. Did the dealer make it clear which repair was the immediate cause and which one they did just to be safe? I haven't really seen many other posts doing a search and going back a few months on this topic of failing fuel pumps.
 

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Discussion Starter #10
Dealer replaced the High Pressure Pump and fuel tube going from it to the fuel rail. It seems to be all fixed now. Can anyone with this model vehicle tell me if there is a clamp/clip that secures the cable going to the High Pressure Pump to the top of the valve cover, next to the pump? My valve cover has a threaded boss with nothing threaded into it and there is no clip or clamp to secure the cables going into the connector on the side of the pump. I have not been able to find a good schematic or a close-up picture of this area to figure out if the tech left off a part (the clip/clamp).
 

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Yup that would be mine! Lol mine went south on me... Hyundia had to replace the starter leaver and the fuel pump! Who would of thunk! Watched my baby drive away on a flatbed!
 

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2012 Kia Optima SX HPFP Replaced

Just had my 2012 Kia Optima SX 51,000 miles taken to the dealership for MIL Code P0087. They Replaced the HPFP (High Pressure Fuel Pump). This is when i found out there is 2 pumps on the car one in the tank and one on top of the engine. I sure hope this isn't going to be a common occurrence.
 

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Low pressure fuel

Yes i just got it to! it set code p 0087, just took it to dealer. will see what they say is the fix.
 

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Lower5hole

Had to have my high pressure fuel pump changed also. Best of all still had 24 days left on the warranty. Got it done at fitzgerld in Clearwater FL. With no hassle. Thanks to Anthony and the service staff.
 

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What is cost to change high pressure fuel pump?

I have the EXACT issue described by the original poster. I purchased my 2013 Sonata 2.4 USED, so I believe it only has the 6/60k warranty. I am at 62k. Any chance Hyundai would budge on the warranty since it so close?
Anyone know the cost to have this replaced?
While I love my Sonata (I also had a 2008 Sonata Limited), I am disappointed that this seems to be an issue for many. Sounds like a defective part(s) were used.

Thanks for any help!
 

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My mechanic called me with more details on my fuel pump issue. He confirmed it was the high pressure fuel pump. He stated that he has had 8 instances of this happening with Sonata's exceeding 60k. Hyundai would not budge on the 60k warranty. The mechanic quoted $593 for the pump and $75 to install. I just purchased the Hyundai OEM pump on eBay for $400 and will get it installed at a different mechanic for $65.

While I had a crash course on many of the positive things high pressure fuel can accomplish in power and MPG, it seems they may have some kinks to work out.
@rafciu123 - Dial it down Kemosabi.
 
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