2nd Gen Non-Engine/Transmission !999 with 275 injectors and Vanaken box

[Turbo Terry]

My mechanic friend says running bigger injectors and a VA box is why I go thru lift pumps(4) so fast and a recent replacement VP44 at 63,000 miles. His 1998 has 90,000 miles and is bone stock and no problems. He says it makes to much pressure for the fuel system. I sure love the extra power BUT it has caused many problems? Is he right?

 

[BKenny]

A lot of poeple that are running bigger injectors and boxes end up adding a fuel pump systems like Fass/Rasp and Airdog . The fuel systems DC put on these things were porly designed. My trucks all stock and my lift pump had to be replaced a couple of months ago at 43,000 . I would like to eventialy run an aftermarket fuel system to help this turd out

 

[big barney]

I have the exact same setup. I'm on my second lift pump. First one was still good when it was replaced. I won a pump in a raffle and changed it for the heck of it. I never drop below 12 psi. My friends truck has DD2's and a EZ and his pump is holding up fine. I have around 70,000 and all is well.

 

[Lsfarm]

275's are Factory Issue

275 Rv injectors are factory issue in the pusher motorhomes. The difference is that in a pusher motor home the fuel tank is roughly at the same level as the engine, and the tranfer [lift] pump doesn't have to work as hard. therefore the lift pump lasts longer.



The problem with our trucks is the poor lift pump location. Too high above and too far away from the fuel tank. If you regularly run your fuel tank down to 1/4 or less, the lift pump has to pull the fuel up about 18-20" which is more than the pump manufacturer spec's the pump for.



Just add a pusher pump in front of the fuel tank, or relocate the factory pump from the engine to the frame down in front of the fuel tank. The pump will last a very long time if it is PUSHING fuel instead of lifting it.



BTW: if your quote from your mechanic is accurate 'makes too much fuel pressure' Then he doesn't know what he is talking about. Neither a fuel box or bigger injectors add pressure to the system. The bigger injectors have no effect on fuel pressure in the system and a fueling box changes the duration and sometimes the timing of the fuel, not the pressure in 2nd Gen trucks.



Hope this helps

Greg L

 

[Turbo Terry]

Thanks for the replys. TT

 

[RobertMiller1]

don't make my mistake

When you relocate your lift pump to the frame in front of the tank. Be sure to use some isolation rubber between the pump and the frame! I hate redo work...

Didn't have any handy and forged ahead anyway. It is much nosier than you would think.