Reply to Geordie's Post: I placed a fuel pressure guage inline after the fuel filter. Then I primed the engine following directions in the Chilton manual. The fuel gauge read 40 psi. This is what the guage read before I did the work to replace the fuel pump, screen and fuel pump. The problem is that the truck won't start. It looks like I have a good spark, and the spark plugs are clean with the grey-brown appearance which the manual claims is the way they should look. I tried pulling a spark plug and cranking the engine to see if I could smell gas at the spark plug hole. I could not smell any gas, so I guessed that the engine was not getting gas for some reason. Seeing that the fuel guage reading was only 40 psi, when the Chilton manual said it should be 64 to 85 psi after priming led me to replace all the parts mentioned so far. I did find that I could force up the fuel pressure by placing a hose on the output side of the fuel pressure regulator and crimping the hose so fuel could not pass back to the fuel tank. This allowed the fuel pump to get the pressure up to the Chilton range of 64 to 85 psi. When I did this the engine would start and run roughly for a minute. Then the fuel guage pressure got above 85 psi and the engine quit.

Reply to Geordie's Post: No I don't think there is a turbo charged version. There is nothing in my Chilton manual about turbo charging and my truck is a basic quarter ton vehicle with a 4-cylinder engine. The fuel pressure specification does seem high for such a vehicle. But the gas lines and rubber hoses appear heavier duty too.

Edited by Customer (name blocked for privacy) on August 14 2006 at 12:35 PM

Reply to Geordie's Post: Yes the book does show a Navajo fuel pressure regulator. I did not look for it before now because I assumed it was the same device but a different operating pressure. The picture of the Navajo fuel presssure regulator in the Chilton manual is a completely different looking device from the picture of the B2600i fuel pressure regulator. So maybe I'm wrong about having the wrong part. You mentioned earlier about the fuel system pressure being raised as the engine revs increased. Would this be to maintain the fuel pressure at the specification of 64 to 85 psi no matter whether the engine is off (ignition key on and fuel system priming) or idling or turning at 2000 rpm. Or does the fuel pressure need to be raised from a primed fuel system pressure of 40 psi when the engine is off and primed, or idling to the higher pressure when the engine is turning at 2000 rpm? The Chilton manual seems to be saying the fuel system pressure should be 64 to 85 psi no matter what the engine is doing.

Reply to Geordie's Post: "If you were to unplug the vaccuum pipe from the inlet manifold, plug the hole at the manifold, suck as hard as you could on the vaccuum pipe until you had created a big vaccuum, and then get someone to start the engine, would it start or attempt to start?"

I've been searching through my Chilton manual for a diagram. Do you mean to disconnect the vaccuum hose at the fuel pressure regulator and plug the hose. Then place a length of hose on the fuel regulator, and apply a vaccuum?

I will need to get a length of hose from the local auto parts supply. Since the truck is not running, I will have to wait until later today. How do I pick up this thread again?