# How do you test fuel pressure on gdi engine? **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [August 12, 2021, 12:17am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667 "2021-08-12T00:17:58Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [August 12, 2021, 12:17am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/1 "2021-08-12T00:17:58Z")
I have a 2012 kia rio. I’ve never worked on a gdi engine. How do you test the pressure? Is it done with a Shrader valve? Does anyone know how high the psi should be? Thanks. ---
**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\ **Post date:** [August 12, 2021, 12:23am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/2 "2021-08-12T00:23:39Z")
[Kia Rio: Fuel Delivery System - Engine Control / Fuel System - Kia Rio UB 2012-2020 Service Manual (kiamanual.com)](https://www.kiamanual.com/kia-rio/fuel_delivery_system-511) [Kia Rio: Fuel Pressure Test (Low pressure system) - Fuel Delivery System - Engine Control / Fuel System - Kia Rio UB 2012-2020 Service Manual (kiamanual.com)](https://www.kiamanual.com/kia-rio/fuel_pressure_test_low_pressure_system_-513) ---
**Author:** ![asemaster](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@asemaster](https://community.cartalk.com/u/asemaster)\ **Post date:** [August 12, 2021, 12:45am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/3 "2021-08-12T00:45:06Z")
The direct injection system runs hundreds of psi, the low pressure supply system just brings fuel up to the injector pump. High pressure is tested by looking at the pressure reading in the data lines on a scan tool. ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [August 12, 2021, 1:28am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/4 "2021-08-12T01:28:46Z")
Is there a way to test the low pressure system? I’m trying to see if the fuel pump or filter is bad. ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [August 12, 2021, 1:29am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/5 "2021-08-12T01:29:25Z")
> [@weekend-warrior](#): > > Kia Rio: Fuel Delivery System - Engine Control / Fuel System - Kia Rio UB 2012-2020 Service Manual ([kiamanual.com](http://kiamanual.com)) Just saw your links above. Thank you. ---
**Author:** ![asemaster](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@asemaster](https://community.cartalk.com/u/asemaster)\ **Post date:** [August 12, 2021, 1:37am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/6 "2021-08-12T01:37:22Z")
> [@jameson.luttrell\_154832](#): > > s there a way to test the low pressure system? Yes there is, as you saw by the link @weekend-warrior posted. > [@jameson.luttrell\_154832](#): > > I’m trying to see if the fuel pump or filter is bad. Why? Is there some sort of issue with the way the engine starts or runs? Is there a fault code? ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [August 12, 2021, 1:41am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/7 "2021-08-12T01:41:44Z")
> [@weekend-warrior](#): > > Kia Rio: Fuel Pressure Test (Low pressure system) - Fuel Delivery System - Engine Control / Fuel System - Kia Rio UB 2012-2020 Service Manual ([kiamanual.com](http://kiamanual.com)) No codes. It seems acceleration in lower rpm is really sluggish. At around 3k rpm it seems to accelerate normally. I really have to press the pedal to make it accelerate. ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [August 12, 2021, 1:43am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/8 "2021-08-12T01:43:00Z")
I think my gas millage is lower than it should be also. ---
**Author:** ![asemaster](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@asemaster](https://community.cartalk.com/u/asemaster)\ **Post date:** [August 12, 2021, 3:03am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/9 "2021-08-12T03:03:29Z")
If you have adequate power at 3000 rpm and high speeds it’s unlikely you have a fuel supply issue. Engines need more fuel at higher rpm and under load than they do at idle and part throttle. You’re going to need some live data from a scan tool. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [August 12, 2021, 4:19am UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/10 "2021-08-12T04:19:02Z")
> [@jameson.luttrell\_154832](#): > > It seems acceleration in lower rpm is really sluggish. That little engine is rated at 115 lb-ft of torque @ 4200 RPMs. In comparison the Dodge Neon engine has 130 lb-ft torque @ 4600 RPMs. This car was not designed for performance. > [@jameson.luttrell\_154832](#): > > I think my gas millage is lower than it should be also. Your fuel economy will improve next month when the burden of air conditioning s reduced. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [August 12, 2021, 12:40pm UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/11 "2021-08-12T12:40:26Z")
OP says power feels down. Now. Compared to previously? Or it has been underpowered since day 1? ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [August 12, 2021, 12:44pm UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/12 "2021-08-12T12:44:35Z")
Me thinks this is a case of buyers remorse more than the vehicle having problems. The thing is probably getting MPG it should and it is 9 years old with unknown miles . ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [August 12, 2021, 3:59pm UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/13 "2021-08-12T15:59:31Z")
The car is definitely slow. It’s just strange how I get little acceleration when pushing the gas till about 1/2 to 3/4 of the way down and it takes off. ---
**Author:** ![jameson.luttrell\_154832](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@jameson.luttrell\_154832](https://community.cartalk.com/u/jameson.luttrell_154832)\ **Post date:** [August 12, 2021, 4:03pm UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/14 "2021-08-12T16:03:36Z")
I knew it was going to be slow. It just doesn’t accelerate smoothly at all. It’s dead slow taking off then accelerates really quickly. It’s pretty dramatic. There’s no way it’s normal. ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [August 12, 2021, 4:03pm UTC](https://community.cartalk.com/t/how-do-you-test-fuel-pressure-on-gdi-engine/178667/15 "2021-08-12T16:03:50Z")
> [@jameson.luttrell\_154832](#): > > The car is definitely slow. It’s just strange how I get little acceleration Did you test drive this before you bought it ?