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Unread 06-06-2013, 06:09 PM   #16
Que89YJ
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do the fuel pressure test.you absolutely cannot tell anything about the fuel system without it.also check your fault codes.

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Unread 06-06-2013, 06:28 PM   #17
ellisfl09
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Hard start

Ok I will do the fuel pressure test. Most likely it will be next week due to work, but the fault codes I had we're the 12,33,55 so no information given there. That was off of the cell light vice a code reader. Thanks again
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Unread 06-06-2013, 08:07 PM   #18
Que89YJ
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they read the same codes. that is good. keep in mind that the obd1 codes don't always tell you when a sensor is bad. if it fails in range it will not blow a code.
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Unread 06-11-2013, 02:35 PM   #19
ellisfl09
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Hard start

Ok I just finished with the pressure test

She ran right at 29-30
When I pulled off the vacuum line she went to about 39

When I shut down the engine it dropped down to 0 before I could even look at the gauge

I assume fuel is leaking past injectors and I need new ones does this sound right.

Thanks for all of the help
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Unread 06-11-2013, 06:12 PM   #20
laybackman
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Quote:
Originally Posted by ellisfl09 View Post
Ok I just finished with the pressure test

She ran right at 29-30
When I pulled off the vacuum line she went to about 39

When I shut down the engine it dropped down to 0 before I could even look at the gauge

I assume fuel is leaking past injectors and I need new ones does this sound right.

Thanks for all of the help
Que89YJ should check in if he can but I would think the fuel pressure regulator is shot.
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Unread 06-11-2013, 06:22 PM   #21
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With the engine running the fuel pressure should be ~ 31psi. If you pull the vacuum line on the FPR the pressure should jump to ~39psi.

If it doesn't the FPR is NG. If it does check the vacuum source for the FPR.
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Unread 06-11-2013, 06:42 PM   #22
ellisfl09
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That's exactly what it does 30 at idle and when I pull the vacuume line it goes to 39 also brand new regulator. After shutting off engine pressure drops to zero
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Unread 06-11-2013, 07:11 PM   #23
Siva283
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Quote:
Originally Posted by ellisfl09
That's exactly what it does 30 at idle and when I pull the vacuume line it goes to 39 also brand new regulator. After shutting off engine pressure drops to zero
You most likely have a bad check valve in the pump. Leaky I jesters when totally shot should drop steadily and take a min or two at least. The check valve in the pump will lose pressure instantly.

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Unread 06-11-2013, 08:45 PM   #24
Que89YJ
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it could be a bad check valve or injector. you need to find the soft hose anywhere on the return line and pinch it off. hook up the pressure guage amd jumper pins 30 & 87 together on the relay socket for the fuel pump for 3d seconds. if the pressure bleeds off then its a bad injector. if it doesn't then the fuel pump is bad.
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Unread 06-12-2013, 03:55 AM   #25
ellisfl09
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I just replaced the fuel pump. Ill pinch off the return but I am unsure what you mean with the relay, could you explain more please

Thanks
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Unread 06-12-2013, 04:47 AM   #26
Que89YJ
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if you just replaced the pump then you have a bad injector you need to pull the rail and see what injector its leaking. if you have the money it could be a reason to upgrade and replace all the injectors.

the relay thing I was talking about is jumpering the relay. if you pull the fuel pump relay from its socket and look at the side of the relay there is a numbered drawing of the relay socket. you can use a little wire and jumper pins 30 to 87 in the socket and the fuel pump will run. outer makes it much easier to troubleshoot the fuel system.
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Unread 06-12-2013, 01:10 PM   #27
ellisfl09
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Ok so based on my symptoms. It is a bad injector? Just want to double check. If so what injectors does everyone recommend? If I have the rail out I figure I may as well do all 4 of them

Again just to be sure cause I don't want to just spend money on parts

New parts: fuel pump, regulator

At idle 30psi
With vac line pulled 39 psi
After shutting off 0 psi within a few seconds

Thanks for all of the help again.
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Unread 06-12-2013, 01:22 PM   #28
Que89YJ
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yes it's a bad injector. get new of rings when you replace. a little oil will help them slide in easier.
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Unread 06-12-2013, 01:35 PM   #29
ellisfl09
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Ok sounds good. I replaced injectors on my 7.3 diesel never on a gas motor.

Do I need an injector puller for this

What injectors do you recommend
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