I have power to the orange wire on the fuel pump relay, but nothing to the fuel pump fuse. not sure if there is a oil pressure switch on this year. not getting power to pump as far as I can tell. Any ides?
Pulled lines off and have no pressure or fuel coming thru.
2007-01-04 10:37:36 · 10 answers · asked by lostintexas 1 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
Book says to check the feul pump relay control circuit but doesn't show where it is or how to find it.
2007-01-04 10:40:58 · update #1
This is not how this circuit works. The fuel pump relay supplies power to the pump for only the initial prime cycle and is controlled by the ECM grounding the relay. The fuel pump relay is located underneath the plastic cover on the right side of the upper firewall inside the motor compartment. The power to the fuel pump comes from the oil pressure sending unit switching contacts when there is enough oil pressure to do so. There is a parallel connector close to the relay with no apparent connection that has a grey wire in it and this is the parallel wire we use to test or jump power to in diagnosis. You can quickly test to see if the relay is working by connecting a known good test light to it and then turning the ignition on. The light will only come on for a second or two and then go out. Continueing diagnosis, now crank the motor until you believe the oil pressure has come up inside the motor and the test light will light until the oil pressure goes down. If this is all okay, you almost certainly have a faulty fuel pump as it is hard wired all the way to the tank's sending unit. You might be able to wiggle the connector out from beside and near the top of the tank to check power to it, but it is damn near impossible to get this apart without lowering the tank. These trucks are not equipped with any type of roll over switch or anything else from the factory that disables the fuel pump circuit. This is a big dirty job so good luck!
2007-01-04 13:40:04 · answer #1 · answered by Deano 7 · 0⤊ 0⤋
yes there is a oil pressure switch but what you are looking for is the fuel cut-off switch or inertia switch and I don't believe this year Chevy had them. not positive, haven't worked on Chevy's in a while.
1st off check your books and find out which fuse controls the fuel pump, see if there is power? no? then its b4 the fuse panel,. yes? its after. basically cut the system in half at a known point. also check all grounds(body,chasis,engine,pump).
it sounds like the pump might be bad, also, need to make sure that it is either a ground side relay or a power side relay. test lights are wonderful things. proper diagnostics prevents extended down time.
2007-01-04 10:57:32 · answer #2 · answered by num1huckfinn 5 · 0⤊ 0⤋
Check the rest of the fuses and fuse able links.Links are down off the starter.The oil pressure switch sure not stop the truck form starting only running.You should have power coming in on two wires to the relay.Check your ign switch too have seen a couple that burnt the ign. switch wire to the relay. If you can get a wiring diagram and go through it to see where the wires go and which one should be power and grounds.GM does not have a reset switch
Good luck hope I helped
GM tech for 20 Years
2007-01-04 10:44:13 · answer #3 · answered by Rudedude 4 · 0⤊ 0⤋
89 Silverado
2016-10-07 07:32:43 · answer #4 · answered by blea 4 · 0⤊ 0⤋
check the autoshut down relay on the firewall or fuel pump ground
2007-01-04 10:40:13 · answer #5 · answered by ricksdollsred 2 · 0⤊ 0⤋
Probably not. But do you need the extra octane? Is the engine detonating during any range of acceleration? Detonation makes a noise, like a sheet of tin rattling under the hood. It is commonly called "ping" or "pinging". Detonation can cause extreme damage to internal components of the engine, so if your vehicle is "pinging" it is advisable to switch to the higher octane gasoline. If it is not pinging, higher octane will only increase your operating expense, since there wil be no benefit of using the more expensive higher octane gasoline. Also your fuel consumption may increase (your mpg will go down)because higher octane ratings are achieved in many cases by adding ethanol (alcohol) to gasoline to make higher octane "gasohol". Since the heat energy value of ethanol is only 8,000 btu per pound compared to the almost 20,000 btu per pound value for gasoline, fuel economy usually will diminish. So... if you have a pinging noise coming from your engine during moderate to heavy acceleration use th 89 octane gasoline.. otherwise use 87.
2016-05-23 03:58:30 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Look in manual and locate the fuel cut-off switch (Inertia Switch). It might need to be reset.
2007-01-04 10:40:25 · answer #7 · answered by tumbleweed1954 6 · 0⤊ 0⤋
have you checked to see if there a fuel filter if so does it need to be changed??
2007-01-04 10:48:28 · answer #8 · answered by bowpeep 2 · 0⤊ 0⤋
You probably outta go to the nearest gas station and put some gas in it.....geez i swear.....
2007-01-04 10:39:21 · answer #9 · answered by Anonymous · 0⤊ 0⤋
put gas in it
2007-01-04 11:40:06 · answer #10 · answered by gary c 1 · 0⤊ 0⤋