Engine/Transmission (1998.5 - 2002) Low fuel pressure

[hilda]

Just moved my fuel gauge to the Schrader Valve (removed valve core) and installed an isolator. I still have 12. 50 lbs @idle but now I have 5lbs@WOT, I did have 7lbs WOT when I had it on the fuel filter. I bleed the hose into the isolator, but did not bleed from isolator to the gauge. I guess my question is do I need to bleed isolator to gauge, or do I need to relocate and replace the LP.

BTW installed new Fuel filter today no difference!!


Thanks in advance

Jim

 

[DFerverda]

Open the isolator and gently push the membrane back to make a good size void, (i used a pencil eraser), you may need to relieve the pressure from the lp. Fill the small hose to the gauge with antifreeze or silicone , as well as the void in the isolator and put it back together. I would relocate the lp and start looking for a new one... ... Lots of options, i wound up using this, life time warranty.
Glacier Diesel Power - Product Detail
Mine has been in for 6 months with out any issues.
I went through 4 stock junk carter's, and 3 walbro 392 pumps. This one has lasted longer then the rest and with the warranty is cheaper in the long run. . This pump is adjustable and mine is set at 19 lbs idle, and i get 16 at 60 and 14 at WOT. Good luck
Dirk

 

[KLockliear]

You also want your reference point at the inlet to the VP44, not on the fuel filter. If you still have stock lines, there is even more of a restriction at the banjo fitting at the inlet to the pump. 5psi at WOT at the filter housing is almost 0psi at the inlet to the pump.

 

[hilda]

Open the isolator and gently push the membrane back to make a good size void, (i used a pencil eraser), you may need to relieve the pressure from the lp. Fill the small hose to the gauge with antifreeze or silicone , as well as the void in the isolator and put it back together. I would relocate the lp and start looking for a new one... ... Lots of options, i wound up using this, life time warranty.





I did the pencil eraser trick, and the hose is only 2 feet long. I have been doing research on LP, wow there is a few to choose from and a lot of different options on them. A life time warranty is very attractive.

 

[hilda]

You also want your reference point at the inlet to the VP44, not on the fuel filter. If you still have stock lines, there is even more of a restriction at the banjo fitting at the inlet to the pump. 5psi at WOT at the filter housing is almost 0psi at the inlet to the pump.

I moved the line from the filter to the Schrader Valve. Which is the test point on the VP44.



Jim

 

[KCraft]

eliminate the isolator!!! best thing i ever did.