87 F150 Fuel Pressure problem
05-14-2010, 02:51 PM
#11
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ok,so my nephew bought a new seperator valve from autozone($50) , but when we looked at it, it has an electrical connection, the original does not, do you all think it will still work ?? Ford wants like $250 for a new one. Also when we disconnected the lines from the seperator, the rear tank line would not stop flowing fuel, seemed strange to me that fuel would keep coming out of tank. At this point we are still trying to trouble shoot what the problem is. Wont start and getting spark.
05-14-2010, 05:42 PM
#12
Senior Member
When you disconnected the rear tank the fuel kept coming out because you set up a siphon. Tie the lines up higher than the tank or plug them.
I don't know if that valve will work or not, I would think not. The original reservoir uses the pressure from the fuel coming in from the tank to switch the return line over to the newly selected tank, not electricity. When you flip the switch in the cab all you are doing is switching which in-tank pump gets power. The reservoir switches the return fuel over to the new tank. The high pressure pump stays on the whole time. Two things can happen when the reservoir stops working: 1/The newly selected tank sends fuel to the engine and returning fuel cross fills into the old tank or 2/fuel from the newly selected tank can't get through the reservoir and the engine dies from lack of fuel. I've had both happen.
Giving advise on this in the past has bit me in the *** since I don't know what system came on which trucks through the years. I'm assuming that you have the same setup as I do since we both have '87s even though mine is a 302.
If you haven't yet I would try replacing the pressure regulator. It's $24 at Autozone. Cheaper than the reservoir.
I don't know if that valve will work or not, I would think not. The original reservoir uses the pressure from the fuel coming in from the tank to switch the return line over to the newly selected tank, not electricity. When you flip the switch in the cab all you are doing is switching which in-tank pump gets power. The reservoir switches the return fuel over to the new tank. The high pressure pump stays on the whole time. Two things can happen when the reservoir stops working: 1/The newly selected tank sends fuel to the engine and returning fuel cross fills into the old tank or 2/fuel from the newly selected tank can't get through the reservoir and the engine dies from lack of fuel. I've had both happen.
Giving advise on this in the past has bit me in the *** since I don't know what system came on which trucks through the years. I'm assuming that you have the same setup as I do since we both have '87s even though mine is a 302.
If you haven't yet I would try replacing the pressure regulator. It's $24 at Autozone. Cheaper than the reservoir.
