Question: No start after head gaskets

[okierzr]

Im headed to another shop to help a friend.They replaced headgaskets on a 2005 kodiak 5500 lly and they said it is not getting fuel to the injectors they have been trying to get it started for 3 days with no luck.I havent done alot to the duramax so im kind of in the dark on where to start.Any help would be welcome.

 

[okierzr]

Its setting a p01093 low fuel pressure during fuel enrichment.now what?

 

[McRat]

Make sure you have a clean filter. Pump filter until it's hard.
Hook up battery charger.
Crank for 20 seconds (a very long time) and let cool a couple minutes.
Repeat.

If it doesn't start, you either have an air leak on the inlet side, or a fuel leak on the high pressure side.

If you replaced the FPRV, it might be the problem. Put a hose & bottle on the exit end of the driver's side rail (small nipple on rail near firewall). If any fuel comes out, you didn't do the shim mod / race valve correctly.

 

[okierzr]

the head gaskets were replaced and now it wont start it has the oem fprv.

 

[okierzr]

It is getting fuel to the engine but not to the rail now what?

 

[RENODMAX]

sounds like a high pressure line isnt hooked up right

 

[McRat]

Make sure you didn't switch:

Crank and Cam sensors (very easy to do, and common)

CP3 Fuel return and feed (harder, but can be done)

Hook up EFILive and check cranking fuel pressure. Should be 4000 psi.

 

[okierzr]

cranking pressure is only 200psi.Is it normal for the fprv make a humming noise when you turn key on?

 

[McRat]

Do a search on Bottle Test. Do the bottle test.

Troubleshooting is a process of elimination when it comes to no-start.

This will eliminate the FPRV as a cause.

 

[okierzr]

I will do that i didnt know if it would cause a no start.

 

[McRat]

If the valve is letting fuel go back to the tank at idle pressure, you won't start.

You can do a simple version, just crank it with the hose off. You need to find where the fuel is going.

 

[okierzr]

Pulled CP3 off and spun with drill and it put fuel out,put it back on truck and primed it and i fired up and all is good.Thank you McRat and duramaxdiesels.com you all are the bomb.:thumb:

 

[x MadMAX DIESEL]

So what the problem?

 

[okierzr]

I dont know what the problem was but its running now.Just reinstalled the CP3 and all is well.