[91chevy6.2]

I have a fuel leak. My "brick" filter is located behind the intake manifold and is attached to the intake by to 15mm bolts. I can see the leak drip with the fuel electric pump running I think the source of the drip is the bleed fuel line that runs to the front of the engine so you can open a valve and bleed the air out of the filter.

My question is what size of fuel line is used for these trucks? The line that is on it now looks to be too big it is not the original.

I am going to replace the filter as well. Has anyone seen these leak around the filter seals? Or has anyone seen a leak coming from the brick where the filter attaches?

 

[78Chev6.2]

I think the air bleed line and the fuel drain line are 1/8 inside diameter but a 5/32 seems to fit fine. The line is unlikely the cause of the leak, there is a shut off valve for both the air bleed and the drain. Try closing the valve tighter. If that fails you will probably need a new seal for the drain valve.

I have never replaced the drain valve seal, but my Haynes manual says to remove the drain plug and using a paper clip with the end bent to form a hook pull the old seal out. You have to be carefull not to scratch the bore. Inspect the bore for rubber particles and remove with compressed air. Use a 1/4 inch bar to install the new seal with some lubricant (Synkut or STP recommended). The seal should seat firmly. Inspect to make sure it is seated squarely and install the drain valve. You are good to go after refilling the system with fuel.

 

[91chevy6.2]

I did not know that there was a drain valve on the filter housing. The valve I think is supposed to be a drain valve is at the end of a hose sitting up by the front of the engine. If this is a drain valve it would be kind of useless since it is higher than the filter.

This filter housing I think has a heater in it. I do not know if it is the same as the one that mounts to the firewall.

The bleed valve on top of the housing does not look like it leaks. However I will check it.

 

[78Chev6.2]

The brick type fuel filter on my truck is a Stanadyne model 80 and is mounted on the firewall. It has a fuel heater, water in fuel sensor and a filter change sensor. The wiring for these features is at the top of the housing. The filter element is attached to the housing with bail wires top and bottom and is removed by pulling straight back from the housing.

As you look at the filter element the air bleed valve is top left with the metal hose barb close by. The fuel drain valve is located low on the right side of the housing with the metal barb close by. These valves are the same to look at, flat black plastic knobs about an inch diameter with a raised cross for grip.

I cannot imagine a manufacturer putting the drain/bleed plug at the end of the hose.

 

[91chevy6.2]

I found the leak. It is coming from the heater or the bleed valve. I pulled the heater and it is cracked allowing fuel to run passed the o-ring. The crack seams to stop before the o-ring but there could be more than I can see. Now to find a new fuel heater.

 

[91chevy6.2]

I pulled the heater again it is definiatly cracked all the way past the o-ring.

 

[91chevy6.2]

I got a heater from the dealer. If you have a friend who is a mechanic and can gets a discount from GM use it. The part was going to cost me $154 and with his discount I got it for $112.