Join Date: Jun 2011
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Fuel Problems, air leak, lift pump and dropping tank
I've always had a small air leak in the fuel line since I bought the truck about a year ago. Since I have not pulled anything significant it was only a problem at WOT or climbing a major hill at freeway speeds. In addition, the fuel pressure gauge only read 20lbs at best at idle and would drop to 13lbs WOT when the air becomes an issue. This is a 95 12v 2500, extended cab. BTW, changing the fuel filter made no difference here.
So last week I decided to replace all the original rubber fuel hoses, filter and lift pump. And also bypass the fuel heater.
So here is the problem:
1) New lift pump is not making pressure - 5 lbs is max
2) Still have small air leak (seen in site tube). I believe the air leak is actually at the tank where it draws the fuel.
For the lift pump, I'm going to hook the feed line directly to a jug of fuel. Then I will know if the new LP is bad or if there is restriction in the line somewhere.
If the source of the air leak is at the tank cap or something inside the tank, is there an easy way to test this? What is the best solution for a cure?
Also, any great ideas on how to drop the tank? I've attempted this twice last week. The problem is the front strap. The extended cab has a two piece drive shaft and the front strap is wedged into the mounting bracket for the drive shaft. I can easily unscrew the strap and pull it away from the bolt. But that is all the movement I can manage without removing the drive shaft mounting bracket. Ideas?
95 2500HD Extended Cab, 5 speed, 4.10 gears, stock tires