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Showing results for tags 'pulse'.
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Vehicle: 1986 Subaru GL Wagon, Dual Range 5 Speed, Carbureted, Weber 32/36 Converted Issue: No longer getting Fuel Pump Signal to the Pump. It would be intermittent, but now seems to be consistent with getting no Signal. I've heard from @Gloyale that the 6 pin Fuel Pump Controller (Relay) only sends power to the pump when there is a Tachometer Pulse on the yellow wire... Is that Signal originated from the Distributor? Also I've heard from @GeneralDisorderin regards to the Controller, that: "The wire going to the pump is usually a blue with red stripe. The control unit will also have a yellow tach signal, black ground wire, and an ignition hot supply (white I think)." Background: The problem began intermittently... if I had an issue with the pump, I could either add Fuel directly to the carburetor to prime the system. Or, I could apply power directly to the Fuel Pump to also Prime the system. Occasionally I would have to do both in order to get the vehicle to run. Once the pump was working, it would not cut-out mid-trip. Not until the vehicle was turned off and then tried to be re-started later; would an issue happen, where I would have to do one off the pre-mentioned priming methods. Now the pre-mentioned priming methods no longer work... What kind of tests can I do to see what needs replacing? I'd like to have the wiring stay this way it was from the factory... however if not I could wire the fuel pump to a switch, racecar style... I'm not sure though; does the tach Signal increase/decrease pump speed based on engine speed? Thanks for reading, hope to keep my Wagon on the Road! -
Hello. thanks for stopping by. First I have spent a good hour searching and digging before I posted this thread."pulse" and other terms I could think of brought up a lot of fuel system stuff but not what I feel is going, IE please hold your tongue for " do your own research" type replies. We are a community after all :0D The real thread starts here: 1998 Subaru Legacy Wagon 2.5 AWD automatic trans. I experience a pulse, " whoosh, whoosh whoosh" sound and feeling that picks up and slows down as the vehicle's speed does ( not engine speed, but vehicle speed) It felt to me like it was coming from the front. Things I have done / checked: 1. New tires and balanced ( needed them anyways did not fix issue) 2. checked boots at wheels , Front + back, No rips I could see 3. Checked boots at trans ( front axles ) no visible rips Unrelated recent maintenance since : oil chance fuel filter replaced Air filter service ( K & N type) Any thoughts/ Questions/ links / other threads related would be greatly appreciated