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[01Dura6.6]

Ok I'll keep an eye on it. Also while I have you guys. The allison tranny. What's a solid operating temp. It was 73 and I was driving through the hills and it was hitting 188. Seems high for no load or not?

 

[01Dura6.6]

How do i adjust the lift pump?

 

[NRA223]

I've never had a Fass so I can't help you there. My Raptor has an adjustment screw on the side. I had a fuel pressure gauge on my filter head until I switched to an lbz regulator

 

[01Dura6.6]

Alright. My light popped in again with the same code so I'm going to look at what psi it's running. I'm assuming it's probably a little over 10 and that's why the lights on

 

[01Dura6.6]

so i realized when i got under there it did not come with a gauge. I have been looking and can't find a good place to buy one. Where is a good place to by one that will fit it correctly?

 

[WolfLMM]

There is a spring in the return fitting, it needs to be shortened to decrease pressure. Mine is too high as well.

 

[01Dura6.6]

There is a spring in the return fitting, it needs to be shortened to decrease pressure. Mine is too high as well.

Should.I hook up a gauge to make sure? Or is that most likely the issue with the engine light.

 

[Burn Down]

A gauge would be best But If I didn't have one and just wanted to test it, back the screw out 1/2 turn and see if your light pops back on.

 

[WolfLMM]

I agree Albert, but the fass doesn't have a screw to back out. The pressure regulator is a spring in the return port on mine. You can take it out and collapse it with some pliers and see if your issues goes away. Make sure to take a measurement of the spring before you mess with it. I'm 99.9% sure that's your problem. 11 psi is the factory setting and it is too high for the lb7 regulator to over come, esp an old tired FPR.

 

[01Dura6.6]

I agree Albert, but the fass doesn't have a screw to back out. The pressure regulator is a spring in the return port on mine. You can take it out and collapse it with some pliers and see if your issues goes away. Make sure to take a measurement of the spring before you mess with it. I'm 99.9% sure that's your problem. 11 psi is the factory setting and it is too high for the lb7 regulator to over come, esp an old tired FPR.

What if i upgraded the FPR. would this eliminate the problem or the would the ecu keep reading that the pressure is too high? If so what FPR should i go with.

Also i can't find anywhere on the web on where to adjust that spring or what fuel gauge to buy to see what it is putting out.

 

[NRA223]

You would have to retune and I wouldn't bother on a stock trans truck. Merchant makes an adapter to put a gauge where the bleeder screw is. Alligator performance sells that and a 0-30 psi mechanical gauge. I used those to watch mine when i had an lb7 reg.

 

[WolfLMM]

This is the spring, it's located in the return fitting. Pump return to the tank. Or the motor side of the fass unit.



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[NC-smokinlmm]

What if i upgraded the FPR. would this eliminate the problem or the would the ecu keep reading that the pressure is too high? If so what FPR should i go with.

Also i can't find anywhere on the web on where to adjust that spring or what fuel gauge to buy to see what it is putting out.

Lbz fpr is best, you will need to get your tuner to rescale the fpr for it. I did one on my lb7 and it made a noticeable diffrence in performance and reduced smoke in my big tune. There is a test port next to the altenator with a schrader valve, I made a test gauge with parts from the auto parts store and hardware store to test mine there before the lbz regulator. Your only worried about it at idle...

 

[TheBac]

A new FPR wont solve a too-high fuel pressure issue.

Add an adjustable regulator in the fuel system, or change the spring like the guys said....

 

[01Dura6.6]

A new FPR wont solve a too-high fuel pressure issue.

Add an adjustable regulator in the fuel system, or change the spring like the guys said....

where could i find an adjustable regulator at? im dmax store and im not quite sure what im looking for.

sorry for the 20 questions guys. brand new to diesels.

 

[TheBac]

A simple Holley regulator works. Personally, Id do the spring mod first.

We all had to start somewhere, but I suggest more reading first.

 

[Chevy1925]

If you do the spring mod, do not cut it down. This won't fix the issue as it increases spring rate. Just try collapsing it

 

[01Dura6.6]

A simple Holley regulator works. Personally, Id do the spring mod first.

We all had to start somewhere, but I suggest more reading first.

On the owners manual for the fass pump it doesn't really specify what size to get that fits in the hole to insert the gauge. Would a normal fuel pressure gauge kit have the right fittings?

Update. This is what I bought. Should work right.
ABN Fuel Injection Pressure Test Kit https://www.amazon.com/dp/B00QL8O3G2/ref=cm_sw_r_sms_awd_x_dtg8xbPX4AHE0