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You are watching: 1988 ford ranger fuel pump relay

General technological & Electrical basic technical and also electrical discussion for the Ford Ranger that does not fit in any kind of other sub-forum.


Ive got a 88 ranger 4x4, ive replaced the in tank fuel pump, both fuel filters, the fuel pump relay, bypassed the inertia switch and also still no power to the pump. When i bypass the wiring harness to the pump ns can obtain power however it will certainly not begin up. The will turn over fine and also has fuel on the fuel rail yet will not fire. And also advice will be helpful.

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Welcome come the forumFirst the No start issue50/50 testSpray gasoline or quick Start(ether) right into the intakeThen try to startIf it starts and then dies you have Spark yet no fuel from the injectorsIf it doesn"t start then you have actually No Spark or short compression50/50, quick and also easyIn 1988 Fuel Pump power originates from a Fusible link most likely.A Fusible attach is a brief wire connected to Starter Relay(battery post), it acts together a slow blow fuse, and also it"s other end connects to Fuel Pump RelayFuel pump Relay base will certainly be Green, that will have actually 4 or 5 slots1 slot will have actually power power(12v) every the time, that is the Fusible attach PowerSo key off, test every slot because that 12v, if no 12v then you will have to find and also replace the fusible linkStarter relay(wrongly called starter solenoid) is placed on inner fender, the is the strength distribution suggest for the vehicle.Battery positive cable is hooked increase on one article of this relay, fuse box, number of fusible web links for alternator and fuel pump power space all on that 1 post.Other larger article in this relay will certainly just have 1 cable, to start motor, NO various other CABLES/WIRES must be on the post, simply starter engine cable.So pretty straightforward wiring, everything on 1 post, starter engine on the other, lol, and also doesn"t issue which article they are reverse-able Red/blue stripe wire on the tiny "S" postIf you have actually 12volts in ~ FP Relay with vital off, then you have actually fuel pump strength there.Turn key onThere have to now be another slot in eco-friendly FP relay base that now has 12v, test because that it, if no EEC relay, Brown Base, may be the problemIf you have a slot 12v key off and another slot through 12v vital on then time to check for Ground.Put FP Relay back inHave someone turn vital on while you touch FP Relay, you have to feel it click closed because that 2 seconds then click open.Fuel Pump only gets strength for 2 secs each time key is turn on, a safety feature.If you don"t have actually a helper, disconnect ground cable top top batteryTurn key onPut finger on FP Relay and also then attach the floor cable come battery, you should feel that click closed and then open, when computer system starts upIf the isn"t closing then computer"s cable to FP Relay or computer itself is badPin 22 on computer is the ground because that FP RelayThere is a ground connection wire available for FP RelayYou need to uncover the OBD1 plug in, it is in the engine bay.Drawing of that here: Ford Ranger - experimentation EEC-IV fitted EnginesFuel Pump slot is labelled in drawing, the slot is the GROUND for fuel pump relay.So the you put a jumper cable in the slot and ground the other finish of the cable the FP relay will close every time vital is rotate on and also it will stay closed, by-passes computer ground.Doesn"t pains anything.If whatever checks the end then test because that 12v at inertia switch, only there because that 2 secs unless you have actually grounded the OBD1 slotNow in 1988 there space two fuel pumps, in tank and also high push pump in the frame rail.They re-publishing the 1 strength wire native inertia switch, there is a splice in the wire by the high press pump.And climate there is the Ground because that the pumps, no electrical an equipment works through 1 strength wire, gotta have 2 wires, 12v and Ground, various other wise no power can flow thru the device, i m sorry is what renders a light pear light up and also a pump spin, power have to FLOW, so you require a an excellent ground on each pumpPower route Battery---fusible link-----FP Relay-------inertia switch--------------Fuel Pumps----Grounds