The van surge when it get hot. the code i get from the scan tool is fuel pump relay low voltage and it rattles when it start to surge. i changed the relay but still doing the same thing.changed the computer, fuel pump, tried an air flow sensor nothing any idea what this problem could be?
Check your ground for the fuel pump relay 1st-next see what the voltage is supposed to be and what you are actually dealing. I doubt the computer sends voltage to the relay if it is even controlled by the computer it is going to be controlled by ground. Most likley the supply voltage comes from the ignition switch or a power relay. Need to test the basics before putting too many parts in it.
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Make sure battery has a full charge and connections all good.You need to check the circuits at the fuel pump relay. Use a digital multimeter to check voltage. Two voltage circuits to relay, orange wire to terminal A at relay, hot all the time, fusible link. Engine cranking, the dark green wire with white tracer, goes hot, that is voltage for control side of relay,Terminal f at relay. When relay is energized, gray wire goes hot and carries voltage to fuel pump, see inline fuse. Whatever voltage reading is at the battery posts, engine cranking, the readings at the circuits I mentioned should be close to the same. I don't know if replacing relay will help?
My 01 Chevy venture just got a new fuel pump put in gas gauge still isn't working proper so had another fuel pump put in same problem. My relay fuse is good fuel pump fuse is good. I have to have my wires checked, make sure my sensor on top of pump connector wires are good. What else can I be looking for?
There is no shut-off switch. Check the fuel pump fuse in the under hood fuse block. Also check for voltage on the fuse circuit, hot all the time. At the fuel pump connector, gray wire is voltage, solid black wire is ground. Have a helper crank it while you check for good voltage and ground at the connector.
Try cycling the the key a bunch of times first before you crank the engine the fuel pump could be weak or the filter getting plugged start by checking fuel pressure first also using a scan tool and checking for codes you can use the scan tool for check your crank signal
It's possible someone used the jumper wire to load side of fuel pump relay, gray wire. That supplies voltage to fuel pump motor, the fuel pump fuse is hot all the time. The fuel pump will run all the time even with key off, running down the battery. They used the jumper because of some kind of problem. Can you unplug the relay and check relay terminals, where the relay plugs in. Use a test light, either a problem on the load or control side of relay. Are the relay terminals numbered, like 30 and 87, maybe 85 and 86 also?
check to make sure the security light is not on if it is the van will have spark but no injecter pulse the best way to solve this issue is to have the original igniton key and put it in the igniton in the run position and leave it on for 10 minutes then the light will flash then try to start the van
unplug fuel pump harness at pump and use a test light and see if turns on when someone starting van. If it does then plug it back in. and try hitting the tank where the pump is while someone is starting it. If it starts replace the pump. If no light comes on then test the fuel pump relay.
use the pressure test port on the top of the engine, it is on the fuel rail that supplies fuel to the injectors, looks like a tire valve, will have a plastic cap on it.
2000 chevy venture run good but my lights flickers and have to jump. After I jump the van and put my meeter on the battery its reading 14.volts at idle. I can drive around to store cut the van off come out it starts fine leave it overnite and it don't started.
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