Bad fuel leak under intake manifold.

[PisaturoJr]

Fuel leak under intake manifold. Injector pump seems OK. Truck starts & runs perfect. Leak is pretty bad. Leave a trail down the street.

 

[Will L.]

Not a fun day, but replace all the rubber line with sae30r9 & new clamps if you see it is the he fuel lines
The original rubber can’t withstand the ethanol in the new diesel fuel.

Other option is the ffm (fuel filter manager) is leaking- kost common there is the fuel heater oring. Unbolt it and raise it up to see.

There is a ton of upgrades to do there while at it if you’re interested but thats the basic things to check

 

[PisaturoJr]

Thanks, Will give it a try. Surburban has 296 K miles. I am 83 & at my age i do not want to buy another truck. Had the 99 surburban since 20000. It had 65K on it wheni bought it.

 

[Big T]

Thanks, Will give it a try. Surburban has 296 K miles. I am 83 & at my age i do not want to buy another truck. Had the 99 surburban since 20000. It had 65K on it wheni bought it.

Will’s suggestions are spot on. Only additional I can add is to check for leaks with a flashlight in the dark. The diesel fuel will reflect and shimmer in the light and you will find the source of your leak.

 

[PisaturoJr]

Thanks, will give it a try.