I wanted to update everyone on my progress as I have been asked to document my 351W EFI swap. Work has had me extremely busy so I apologize for moving so slowly (funding issues apply also).
Today I will discuss fuel rails. As you know, a 351W intake manifold is wider than that of a 302/5.0. This prevents stock Mustang fuel rails from fitting without modification. You are essentially left with two options for fuel rails:
1. Aftermarket fuel rails from Vortec, Mallory, Aeromotive, etc which are $300+.
2. Modify a set of stock fuel rails.
I chose to modify a set of stock fuel rails. I did not like that the Mustang fuel rails have their inlet/outlet points on the passenger side, front of the engine. I had already run -6 AN lines along the driver’s side frame rail for my previous carb setup so I started looking around for other applications. Ford Explorers with the 5.0 use a different set of fuel rails that some on the Mustang websites say flow better than stock Mustang rails. The inlet/outlet on the Explorer rails are in the rear / driver’s side yet still leave the fuel pressure regulator in the stock location (aftermarket AFR are available from Kirban, etc).
You have to be careful in that sometime around 1998-1999, Ford switched the Explorer to a “no-return line” fuel injection system. Found this out the hard way when I ordered fuel rails for a 1999 Explorer.
1996 has the correct application that we are looking for and is the year that I used on mine. I cut off the stock flexible lines and replaced with longer fuel injection hose and used fuel injection hose clamps (this is very important).
As you can see, everything fits and there are no clearance issues with my intake even without a spacer of any kind (just set it on to see).
Cost for this so far?
1996 Ford Explorer fuel rails – www.corral.net
Fuel Injection hose - $8
Fuel injection hose clamps - $4
Not bad so far and much cheaper than the aftermarket. One issue that I have to work thru and would have been an issue with any fuel rail is a clearance problem for the heater intake tubes that follow along the top passenger side of the intake. I think that since the 351W intake is wider, the bend does not have enough clearance. I will attempt to modify with my trusty BFH to see if it will fit.
Next update: Swapping the manifolds. Stay tuned.
70EB, 351W SEFI, ZF, D20, 3.5"SL, 1"BL, 35" KM2s on polished Slots, Sunburst Orange Metallic