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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   2006 Toyoto Camry XLE Driver Side Electric Window Trouble Hello, Looking for a little brain help ...   Tierod end change caused some kind of leak Hello so I just took my car to the nearb...   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...   Chevy strut replacement I'm trying to get a sensor of some kind ...

Search Auto Parts Search Fuel Pump Relay Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Engine Troubleshooting gatliff User Sep 11, 2005, 4:53 PM Post #1 of 6 (3086 views) Fuel Pump Relay Sign In would a Fuel Pump Relay make a motor idle poor or stall out at idle if the relay is good should you hear it click it you unplug it then plug it back in with the key on ? also the same thing with the IAC should you be able to hear it work ? the truck is a 93 chevy 1500 4.3 DanD Veteran / Moderator Sep 12, 2005, 4:05 AM Post #2 of 6 (3079 views) Re: Fuel Pump Relay Sign In The short answer to your questions is no. If you want an explanation as to why post back. Dan. Canadian "EH" Tom Greenleaf Ultimate Carjunky / Moderator Sep 12, 2005, 8:46 AM Post #3 of 6 (3074 views) Re: Fuel Pump Relay Sign In Not the highest on the list but possible. The older and maybe newer Ford ones use points inside them and they may NOT transfer enough power. gatliff User Sep 12, 2005, 10:08 AM Post #4 of 6 (3072 views) Re: Fuel Pump Relay Sign In got a ohm/vote meter been checking anything I can all check good it got me harleyguy User Sep 14, 2005, 12:12 PM Post #5 of 6 (3055 views) Re: Fuel Pump Relay Sign In I have a '93 GMC Sierra with a 4.3 and my experience with the fuel pump relay is; it's either actuated or not. Check to make sure you have good fuel pressure on the rail. Your fuel filter could be clogged. The fuel pump could be weak. You may have a bum rotor or dist cap also. It is usually the simple things that we pass up that come back to haunt us. Or at least me anyway. Sometimes it seems my luck with vehicles is worse than my luck with women. DanD Veteran / Moderator Sep 15, 2005, 4:53 AM Post #6 of 6 (3042 views) Re: Fuel Pump Relay Sign In Ok maybe if we explain how the fuel pumps relay and its circuit works, we’ll be of more help getting to your truck problem. When you first turn the ignition to the run position and wake up the computer the computer will apply ground to the pull-in coil of the pumps relay which in turn closes the contacts in the relay allowing the pump to run. This is called the prime cycle, the computer will remove this ground after about 2 to 3 seconds if there isn’t an ignition pulse from the ignition module. As you continue to turn the ignition switch to the crank position the ignition module will start to create a pulse (due to the engine turning), that the computer recognizes as spark and again applies ground to the fuel pumps relay allowing the pump to run. They also incorporate a back-up way of turning on the fuel pump through the oil pressure switch if the fuel pump relay fails. Let’s say the relay will not close for whatever reason. You start to crank the engine sooner or later oil pressure will start to build. As this pressure is applied to the oil pressure switch it closes a set of contacts and applies 12 volts to the fuel pump feed wire again allowing the pump to run. So if you have a constant 12 volts being applied to the fuel pumps gray feed wire then electrically it’s not the pump. Electrically and mechanically are two different things and that’s where you need to connect a fuel pump pressure gauge the system. Tee the gauge in, I’m pretty sure there is a shraider (sp?) valve on the fuel rail to connect to, back by the distributor. That way you can drive this thing down the road and watch the pressure while the truck is doing its thing. The pressure should be 55 to 60 psi and with this style of injection 50 psi doesn’t cut it, that’s not enough to open the poppet vales of the injector nozzles. But this takes us to a whole different story. LOL Dan. Canadian "EH"   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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