Spraynlog
04-05-2008, 09:36 PM
I bought the '86 T&C wagon last year in January. It needed a good bit of work to make it a daily driver for my daughter. I changed the fuel filter as a regular maintenance item, also replaced the original factory fuel hoses under the car and at the fuel reg and rail. (I put in Goodyear FI hose)
Later I did a fuel pressure test, and it showed a rapidly oscillating needle between 45-55. It would only dead head to 60 psi or so. Somewhere along the line the fuel pump was wired up so that it stayed on all the time if the key was on. I switched it back to original wiring, but then it would die after a couple minutes running. I returned it to the way it was, with the pump running with the key on. I also installed a new fuel pump from NAPA.
The NAPA pump would only dead head to 70 PSI, but no more oscillating needle. So today, I switched in a different power module (JY item) and set the wiring back to stock. The car keeps running as it should, but the pump still only gives me 70 PSI dead head pressure. It maintains 55PSI with the motor off for over 10 minutes, so no leaky injectors or problems with pump check valve. I have also just installed a fresh fuel filter in the last couple days. (NAPA Gold) I probed the wire to the pump at the fuel tank with a DMM and got 13.56 volts.
So my question for all you experts is, Am I missing anything? Should I just get a new pump (Walbro 255?) Why am only getting 70 PSI?
Sorry for the long post but I'm a bit frustrated...:confused2:
Later I did a fuel pressure test, and it showed a rapidly oscillating needle between 45-55. It would only dead head to 60 psi or so. Somewhere along the line the fuel pump was wired up so that it stayed on all the time if the key was on. I switched it back to original wiring, but then it would die after a couple minutes running. I returned it to the way it was, with the pump running with the key on. I also installed a new fuel pump from NAPA.
The NAPA pump would only dead head to 70 PSI, but no more oscillating needle. So today, I switched in a different power module (JY item) and set the wiring back to stock. The car keeps running as it should, but the pump still only gives me 70 PSI dead head pressure. It maintains 55PSI with the motor off for over 10 minutes, so no leaky injectors or problems with pump check valve. I have also just installed a fresh fuel filter in the last couple days. (NAPA Gold) I probed the wire to the pump at the fuel tank with a DMM and got 13.56 volts.
So my question for all you experts is, Am I missing anything? Should I just get a new pump (Walbro 255?) Why am only getting 70 PSI?
Sorry for the long post but I'm a bit frustrated...:confused2: