Engine/Transmission (1998.5 - 2002) Fuel Pressure and Ambient Temperature

[RClark]

My fuel pressure stays at 13-14 psi as long as the ambiernt temp is below 75 and the fuel temp under 95. When these points are passes, singularly or together, the pressure drops to 8psi. Its like the higher temps cause something to revert to the starting voltage for the FSP. Connections to the pump are good.

Any ideas?

 

[Moose Truck]

It's most likely the lift pump is failing. :{ Do you have the factory LP? If so, you should consider changing to an aftermarket LP, Such as FASS, or my favorite the DGP; http://www.glacierdieselpower.com/product.asp?pf_id=3929852 Oo. Your VP44 will thank you! Oo.



Are you running an aftermarket LP? there is no mention in your Signature



Moose00

 

[RClark]

Factory pump, Vulcan relocation kit. Pump only 13k on it.

 

[Crazy Horse]

I saw all my LP and VP problems arise on our hottest days here in SC. I noticed no problems below 80 or short tripping. The last 5-6 weeks have shown "dead pedal" on the hottest days low to upper 90's and set multiple 216 codes. Up until the last 5-6 weeks the truck ran strong and no warning signs of problems.



The truck is in the shop now getting a LP and VP.



This weekend it gets the Walbro 392.

 

[RClark]

What's a Walbro 392?

 

[ILIANBG]

That's the pumpm Glacier Diesel uses instead of the factory Carter.