1987 Fuel pressure problems!
#1
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Location: Massachusetts
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1987 Fuel pressure problems!
alright... ive been having this problem for a while on my 87 with a 5.0... the fuel pressure will just randomly drop for no known reason
i changed the fuel pump in the tank.. external fuel pump and the fuel filter.. i also did a complete tune up when i bought the truck not to long ago..
its the EFI model with dual tanks...
any advice on what could be the issue here??
thanks alot!!
-Glen
i changed the fuel pump in the tank.. external fuel pump and the fuel filter.. i also did a complete tune up when i bought the truck not to long ago..
its the EFI model with dual tanks...
any advice on what could be the issue here??
thanks alot!!
-Glen
Last edited by Glen; 10-25-2007 at 08:59 AM.
#2
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Just curious - how did you determine the fuel pressure dropped?
Assuming you have fuel injection - I get confused on what model year the change was made from carbs. If so, there is a fuel pressure regulator on the fuel rail, along with a related control vacuum solenoid. Don't hear of a lot of trouble from these, but it's there, so it could be a problem.
Also, can you tell if the pumps remain running? Thinking about the possibility of the relay dropping out intermittently. Then there's always the possibility of a wiring problem somewheres in between.
And - welcome to the site!
Assuming you have fuel injection - I get confused on what model year the change was made from carbs. If so, there is a fuel pressure regulator on the fuel rail, along with a related control vacuum solenoid. Don't hear of a lot of trouble from these, but it's there, so it could be a problem.
Also, can you tell if the pumps remain running? Thinking about the possibility of the relay dropping out intermittently. Then there's always the possibility of a wiring problem somewheres in between.
And - welcome to the site!
#3
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i have a fuel pressure guage hanging out of my hood lol... i also replaced the fuel pressure regulator as well..
i can hear both pumps working properly when im not moving but i have no idea whats going on when im moving
thanks!
i can hear both pumps working properly when im not moving but i have no idea whats going on when im moving
thanks!
Last edited by Glen; 10-25-2007 at 08:59 AM.