Fuel Delivery Problem
03-12-2011, 11:39 PM
#1
Fuel Delivery Problem
I have a 98 Mustang GT, PI swapped heads, manifold, and comp cams.
My car is running fine under low vacuum, but when I get on it it vapor locks and does not pull. I just replaced the plugs and wires so I know that it is not misfiring. My only guess would be a vacuum line or a Fuel Filter? I checked the fuel pump and it is working properly.
Thank you all for any help.
My car is running fine under low vacuum, but when I get on it it vapor locks and does not pull. I just replaced the plugs and wires so I know that it is not misfiring. My only guess would be a vacuum line or a Fuel Filter? I checked the fuel pump and it is working properly.
Thank you all for any help.
03-13-2011, 10:18 AM
#7
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
I have a 98 Mustang GT, PI swapped heads, manifold, and comp cams.
My car is running fine under low vacuum, but when I get on it it vapor locks and does not pull. I just replaced the plugs and wires so I know that it is not misfiring. My only guess would be a vacuum line or a Fuel Filter? I checked the fuel pump and it is working properly.
Thank you all for any help.
My car is running fine under low vacuum, but when I get on it it vapor locks and does not pull. I just replaced the plugs and wires so I know that it is not misfiring. My only guess would be a vacuum line or a Fuel Filter? I checked the fuel pump and it is working properly.
Thank you all for any help.
What you describe sounds more like fuel starvation from insufficient fuel pressure--have you monitored the f/p?
Do you have the return-type or returnless fuel system--as I understand 1998 was when Ford switched to the returnless system and some of each were produced for the 1998 MY.
A bad return-type FPR would create just the problem you describe...
03-13-2011, 10:21 AM
#8
03-13-2011, 10:32 AM
#9
Vapor lock is an extremely unusual occurrence in moder EFI automobiles, incorporating in-tank fuel pumps, and higher fuel line pressures as compared to carbureted engines. I doubt very much that is what you are experiencing.
What you describe sounds more like fuel starvation from insufficient fuel pressure--have you monitored the f/p?
Do you have the return-type or returnless fuel system--as I understand 1998 was when Ford switched to the returnless system and some of each were produced for the 1998 MY.
A bad return-type FPR would create just the problem you describe...
What you describe sounds more like fuel starvation from insufficient fuel pressure--have you monitored the f/p?
Do you have the return-type or returnless fuel system--as I understand 1998 was when Ford switched to the returnless system and some of each were produced for the 1998 MY.
A bad return-type FPR would create just the problem you describe...
Thread
Thread Starter
Forum
Replies
Last Post
zanemoseley
2005-2014 Mustangs
6
09-06-2015 12:58 PM
