HELP 7.3 cuts off

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May 25, 2016 | 12:22 PM

#46

Rikster-7700

Fleet Mechanic

Joined: Aug 2006

Posts: 1,465

Likes: 17

From: Jacksonville, FL

Quote:

Originally Posted by 02stroke

Pressure is at 2.51 when idling, drops to.60 when I step on the pedal

what pressure are talking about here? it can't be fuel pressure as there is no fuel pressure sensor built in to these trucks from the factory, and your FP should be up around 60 PSI idle

May 25, 2016 | 12:52 PM

#47

02stroke

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Joined: May 2009

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Quote:

Originally Posted by Rikster-7700

what pressure are talking about here? it can't be fuel pressure as there is no fuel pressure sensor built in to these trucks from the factory, and your FP should be up around 60 PSI idle

That's from his Snap On Solus Edge scan tool

May 25, 2016 | 12:55 PM

#48

02stroke

Thread Starter

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Joined: May 2009

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Quote:

Originally Posted by Nicmike

Check the FPR spring on the return line back to the fuel tank. Also, has your fuel bowl been rebuilt yet over the course of the truck's life?

I have a FRX on it, I rebuilt the fuel bowl 2 years ago, but with all the stuff that came out the tank it probably is clogged

May 25, 2016 | 01:26 PM

#49

mb_01sc

Mountain Pass

Joined: Mar 2004

Posts: 196

Likes: 7

From: Lago Vista, TX

I haven't personally experienced this, but have you tried unplugging the fuel bowl heater? Was the bowl heater replaced when you rebuilt it?

It was a suggestion sent my way under similar circumstances. I believe they normally short and blow a fuse, but maybe a draw issue?

Sorry if I missed you mentioning this one already.

May 25, 2016 | 01:35 PM

#50

Rikster-7700

Fleet Mechanic

Joined: Aug 2006

Posts: 1,465

Likes: 17

From: Jacksonville, FL

Quote:

Originally Posted by 02stroke

That's from his Snap On Solus Edge scan tool

Ok, but what pressure is it referencing?

May 25, 2016 | 02:35 PM

#51

HKusp

Lead Driver

Joined: Jun 2007

Posts: 7,760

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From: Hampton, Maryland.

That is NOT a correct fuel pressure. As was stated earlier, you don't have a fuel pressure sensor on your truck unless you plumbed one yourself, (or the previous owner) and if that were the case, the PCM wouldn't be reading it, and therefore neither would the Snap On scanner. You would have an aftermarket gauge somewhere if it were added, no way that Snap On would be pulling that from the OBDII port.

May 25, 2016 | 03:49 PM

#52

02stroke

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OK Lots of updates. First of all, it is fixed! I called my cousin who is in the Navy and works on these trucks & other Diesel equipment. He told me to put the Mechanic on the phone. He told him to crack cylinder #8 and #1 and bleed them. It was air the system the whole time. The truck response is the best I have seen it. It BETTER be since I have all this new parts. I want to thank ALL of you who helped me diagnose this thing. You guys are the best, and I am thankful to have this wealth of knowledge at my fingertips. If only you guys could teleport over here when I need you, LOL. Thanks All!