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-   Hyundai Sonata (https://www.hyundaiforum.com/forum/hyundai-sonata-19/)
-   -   How to test pressure from fuel pump (https://www.hyundaiforum.com/forum/hyundai-sonata-19/how-test-pressure-fuel-pump-8607/)

blackbox19 07-05-2010 03:57 PM

How to test pressure from fuel pump
 
I can not find a schrader valve to hook a test gauge too. Any one know how or where to test the pressure of the pump.

NovaResource 07-05-2010 04:21 PM

http://www.hmaservice.com/data/Passe...G/eca9067a.gif

blackbox19 07-05-2010 04:25 PM

Forgot to say its a 2001

mikeross 07-21-2010 07:38 PM

  1. Relieve fuel system pressure. Take the back seat cushion out and remove the access panel underneath to disconnect the connector for the fuel pump assembly module. Start the Hyundai Sonata and let the engine run until it stalls from lack of gasoline. Turn the ignition off and disconnect the negative battery cable.
  2. Disconnect the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.
  3. Twist off the fuel pressure test port cap and secure a pressure gauge to the fuel pressure valve. Reconnect the negative battery cable and start the engine. Disconnect the vacuum hose again and check the gauge. It needs to read between 38 and 50 pounds per square inch. High pressures indicate that the pressure regulator is malfunctioning. Low pressures indicate that the fuel filter is clogged or that the fuel pump needs to be replaced.
I saw this on ehow.. And I used this guide when I checked the fuel pressure of my car.

blackbox19 07-21-2010 08:31 PM

there is no test port. There is only 2 lines. One pressure and the other return.

bigblacksona 08-25-2010 03:45 AM

anyone figured how to do this? I confirm there are 2 lines in my 2001 Sonata 4cycl. One has 2 bolts and the other is a rubber hose with a ring. I suspect the hose with the bolts is the fuel line and the rubber hose is the return? Can anyone confirm on that? Thanks.

sbr711 08-25-2010 07:02 AM

You need the adapter from the Hyundai fuel pressure test kit.

Remove the pressure line from the rail, then install test port adapter in between rail and fuel supply line... then install fuel pressure gauge...

I'll take pic of it later today..

blackbox19 08-25-2010 10:41 AM

You can check pressure from the hose that has the clamp on it. DO NOT remove the one with the bolts holding it on. Unless you got the right adapter, which I didnt. that hose that goes to the intake is a vacuum source for the pressure regulator. I used the autozone fuel gauge rental deal. Take the clamp hose loose and put a 1 or so foot piece of hose on, then use the T fitting and attach the gauge. then attach the hose you removed to the other side of the T fitting. That hose is the return fuel line to the tank. Now turn key to prime the pump and see what pressure. Then crank and see the pressure. Then rev the car up to about 4k and see the pressure. It should not drop.

I used a hand vacuum pump(autozone rental) and pulled about 12 pounds on the regulator to simulate idle then release it and simulated High RPM to verify the regulator was working.


My Issue was the MAF sensor. I replaced it and all is well. 39 bucks on ebay brand new... 195 at autozone...

sbr711 08-25-2010 11:28 AM

1 Attachment(s)
https://www.hyundaiforum.com/forum/a...1&d=1282753530


2 of our adapters from fuel pressure kit. They fit between the fuel rail and the pressure hose that feed the fuel rail..

mtycoon7 10-25-2014 12:12 PM

fuel pressure gauge adapter
 
Where could purchase the adapter?

SNUFFY559 01-05-2017 01:49 PM

Will that cause the turn but no start no fuel to the fuel rail? The fuel pump, regulator were replaced & still have the same symptoms.

onephat66 02-04-2018 03:43 PM

Curious to hear the input on this SNUFFY559, too bad no one is willing to chime in. My daughter's '07 Santa Fe Limited will crank all day, but won't start. I'm thinking an immobilizer issue, but was going to check fuel pressure until I discovered Hyundai's dumb asses didn't put a test port on these engines.

Edward Mebarak 04-20-2020 09:00 PM

what was the original symptom>? how was the engine behaving?

hanky 04-21-2020 04:15 PM

Hi Ed,
The last post was dated Feb-2018, probably doesn't own the vehicle anymore.

Jeremy 07-28-2022 07:18 PM

2018 sonata runs in the morning to work no issue ran home fine 10 minutes later went to leave and just turns over no start in Texas 104 today

hanky 07-29-2022 12:35 PM

Hi Jeremy,

Do you know how to check for spark, and do you have some tools to work with?

There is no sense going through an entire procedure if you don't have the tools or some background.
Please don't misunderstand, working around gasoline with experience can get nasty and if you are not equipped for that , your safety is very important and maybe best if you have a shop look at your vehicle.


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