Looking At A 1996 7.4 With MP

[Upstate]

Came across a 1996 Suburban 3/4 ton with a 4wd GM replacement tranny and a 7.4 just rebuilt by a well thought of machine shop with all of the receipts.

I can buy the truck pretty cheap because when you turn the key the fuel rails make a hissing noise and won't start. It starts to fire, but not quite.

I would install it in one of The two k5 I have.

Ideas and thoughts?

 

[Upstate]

What would it take to install in the 87 k5

 

[eagle mark]

Check the fuel pressure.

For the swap it's a lot of wiring to remove old EFI harness and install harness from donor truck, fuel pump upgrade. Then a re-flash of PCM to remove what's not needed. Having both complete trucks makes for nice swap!

 

[Upstate]

Are you thinking the pressure is too high and that is why it is making the bleeding sound or it is too low?

 

[eagle mark]

I'm thinking it's out of fuel!

It's the only time I have heard a hissing noise from a fuel rail.

But could be bad pump or? Real easy as they have a schrader valve to hook up fuel opressure gauge, turn key on and should be 40ish pressure for 2 seconds, then off till crank and run should be 43.5. (Check for actaul pressure for that engine)