1991 camaro RS Fuel pump not working- no power to pump
Last week engine quit starting/running, started by replacing fuel pump relay under hood and (no luck). Replaced fuel pump in tank (it was not running), no luck on fuel pump either. It's not receiving power with key on or even tried by putting gas down intake and engine running for 1-2 minutes (still no power to pump). Have checked visually and by hand many wires and connections.....No Luck! The engine/intake is not receiving any fuel at all before or after this problem started.
Have heard about a oil/press/saftey switch or something like that associated with fuel pump that may be the problem. Have not found a fuse to fuel pump either if there is one? Any ideas?
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Re: 1991 camaro RS Fuel pump not working- no power to...
If the oil pressure switch has two wires on it it may be one that shuts down the pump. I'm not positive but I think it completes a ground circuit, not the hot side though (but may run through a relay.) There should be a pump relay under the hood with a group of other relays. I don't have a wiring diagram for your car but you can get a basic diagram in most inexpensive manuals. They wont usually give you locations but at least you can get an idea of how the system works. There usually is a fuse. If the fuse block is not labeled, use a test light and probe the back of every fuse for power with the key on (takes about ten minutes and faster than trying to find info) change any that are blown. The most likely culprit is a relay, so after testing fuses look for it. (usually on drivers fender or on right side near firewall.) Worst case, trace the power lead all the way through the harness 'till you find where power begins.Testing is important here...I could give you much better info if I was there to do it for you. Most important is to stay "on track" till you find the place where power ends. Don't jump all over the place or you will end up doing an incomplete test.
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Because it is not getting any fuel! as soon as the ether burns up if no fuel then it quits. check all fuses and relay for fuel pump. to check fuel pump to see if its running. have someone turn the key to start, while somebody is under car at fuel tank. hold hand on tank, if it works you will feel the vibration from pump. most relays for fuel pump are in under hood fuse box. a fuel pump if good, will only run a few seconds to build up pressure in line. when engine starts it runs continuously. so you may have to turn key on a few times. Good-Day!
Check the following:
- Listen to the fuel pump noise under the fuel tank.
- Starter signal.
- EFI relay, under the hood fuse and relay box.
- Fuel pump operation and pressure.
- Regulating valve.
- Circuit Opening Relay (COR) under the dash.
- Check for open in harness and connector between circuit opening relay and fuel pump, and fuel pump and body ground
A relative of mine has a '97 GMC 1500. 2 years ago I spent several weeks chasing gremlins on it. Replaced everything - plugs, wires, ICM, TPS, and some other items. How many miles on your truck? It should fire within 1 to 3 turns of starter engagement. I have to ask, how do you know there is no spark or fuel when the engine does not start? Have you checked fuel pressure? Our trouble ended up being the fuel pump. We pulled the bed off the truck and found that the lines and wires at the top of the tank were severely rusting and eroding. I would have never guessed this kind of degradation due to the fact that the truck is so well taken care of. Check your fuel pump and tank thoroughly. Also check the tank filler neck and vent. If it runs for 15 minutes then quits, sounds like the fuel pump might be cutting out. Will not hurt to check and may save you time under the hood. I have poured over those electrical diagrams for the GMC. Alot of things tied into keeping those engines going nowadays. Let me know how things work out. GC.
HI. Engine loping at idle in a stock RS camaro will likely be caused by bad fuel injectors. The throttle body on your car has two large injectors and usually the drivers side will short out leaving the passenger side over-working. You can see this occuring if you remove the air cleaner lid and use a very bright flashlight to look at the spray pattern for both injectors. They should look the same roughly. There could be a vacuum leak at the MAP sensor hose, there could also be stuck open EGR valve as well, commonly there is a problem with the Engine Coolant Temperature sensor and wiring connector that may be the cause of your problem. As far as the vapor leak in the fuel system, check the fuel hoses near the gas tank and the smog canister under the hood for cracks or broken places. I have had to replace many fuel pump o-ring seals on these cars though. The spot where the fuel pump hanger mounts into the fuel tank has a large diameter o-ring that cracks and splits very commonly, also if the fuel pump was replaced, sometimes people don't quite get the seal to stay in place just right.
The fuel filter is usually in front of the tank close to rear axle. GM had a lot of problems with the in tank fuel pumps. That is probably your problem but the fuel filter would be a good place to start. Also listen for the fuel pump running when you first turn on the key. It should run for a couple of seconds, if not you could have a bad fuel pump relay. Please rate my answer so I get points for it.
Vapor lock? That might happen in a diesel engine, but I have never seen that in a gas engine.
It is more likely there is something obstructing the flow of fuel from the tank to the pump. That is not a very long distance to travel considering the pump is in the tank. This "over-working" can cause the pump to draw too much power tripping relays/breakers.
Just because the pump was replaced doesn't mean it is not bad. An obstruction could have also damaged the new pump if it is not a manufacturing defect.
I do understand that Nissan parts are kind of expensive and I would have the pump replaced just on principle since it is probably still under warranty.
I have seen a few similar situation with residual gas tank contaminants (sugar) damaging pumps. (fluid pumps tend to burn up when they don't have a liquid to cool the internal components) No flow is very bad for the life of a pump.
Furthermore, if such vapor lock does exist and can easily be bled off by relieving pressure from the last injector in the series. (gasoline fuel injectors are different from diesel injectors, so trapped air is typically forced through the system without any priming necessary)
There is a box under the hood next to the battery with fuses and relays. there is a fuel pump relay and or Auto shut down relay that could be bad. It shuts down the entire system ignition and or fuel pump. ASD Relay.
Under the hood in the engine compartment on top of the left fender well or the drivers side you will see three small rectangular shaped plastic modules. One is the fuel pump relay one is the horn relay and one is the starter relay. Before you buy another to replace the fuel pump relay at a cost of about $16.00 take the horn relay and put it in place of the fuel pump relay. If your problem is solved go and buy another relay and install it in place of the bad relay. These relays go out frequently in the older Fords. It's been in there a long time and the points that make contact get burned after years and years of service and quit working when they get hot. A very common problem. Good luck.
A fuse will blow for 2 reasons .
1) If the device has a Short in the circuit that runs through this fuse.
2) If the device draws more amperage from the power source through the fuse than the fuse will handle.
ex. if a fuel pump or starter has a 20 amp fuse and the starter/fuel pump is going bad and draws 30 amps
it will blow the fuse.
A fuel pump on a 1996 vehicle is located in the fuel tank and is kept cool by the surrounding gas and the gas
that flows through it. Overheating a fuel pump is virtually impossible.
That being said there is a High probability that replacing the fuel pump and relay will fix this problem.
It is quite common for this to occur in the GM vehicle of 1996. When the pump starts to fail, it draws an
excessive amount of amperage and would blow the fuse. Hope you find this information useful.