Question about 1994 GMC Jimmy

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The truck will turn over the fuel pump comes on but the truck will not crank up

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Suspect engine coolant sensor. ets up a rich fuel mixture like the old cars needed to start. The intake air temp works with the coolant sensor Good Luck, Ned

Posted on Sep 28, 2009

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I have a 2005 Blazer ZR2, the fuel pump was not turning on. I had the pump replaced. It ran for 1 day then the next day the pump was not coming on again. I tried a new fuel pump relay...still no pump...

Does it have spark ? If so it's nothing to do with the crank sensor ! Does your blazer have a tachometer ? does it move when cranking the vehicle ? If so , it's not the crank sensor ! How to test an electric fuel pump GM CPI case study

Feb 11, 2015 | Cars & Trucks

2 Answers

96 tahoe . It will not crank up unless I pour gas into the throttle body . Once it cranks it will run untill I shut it off but want crank by itself . Why

First, lets be clear with terms. To crank is to turn the engine over, you can do this manually with a wrench on many vehicles. It requires no spark or air. To turn over or to fire is when you achieve combustion. Example: You could pull the spark plugs on a vehicle and turn the key and it would crank, but it wouldn't fire or turn over.

Now it sounds to me like your vehicle is cranking but not firing unless you pour gas in it. My first thoughts are fuel system. I'm assuming it can't be fuel pump because it runs once it fires. Perhaps the fuel pump isn't priming itself, or perhaps somehow air is getting in the line between the injector and fuel pump? Test the fuel pump first by turning the car from off to on (not starting, just on). You will usually hear a short buzzing noise coming from the engine bay that stops shortly afterwards, that's your fuel pump pressurizing the line. (Pro Tip: If you ever try to take your key from off to straight to start and the vehicle doesn't start on the first try, but does the second time no problem, try delaying at on for a moment before trying to start. This gives your fuel pump time to pressurize the line.) Assuming your fuel pump is charging the line, the next place to look would be at the path the fuel takes to the throttle body. When you crank it over and it doesn't start, are you getting any fuel? If you can't see where the fuel enters the system try smelling the exhaust while cranking without it firing, if it smells of fuel you're good and need to look at air flow and spark, if not it's a fuel issue.

Past that, I'll leave it to someone more experienced than myself, but that would be how I troubleshot my own vehicle.

Oct 17, 2013 | Cars & Trucks

1 Answer

I have a 1991 Nissan 300ZX and when I turn the key on the fuel pump will not keep pumping please help

When you turn the key to on, not start, the pump should come on for about two seconds and then shut off. It won't come back on until the car is being cranked. Then it should be on, and remain on when the car is running.
If the car won't start, and you suspect a fuel or fuel pump problem, the best way to check it is have the fuel pressure tested. Correct pressure at the injectors is critical for the engine to get enough gas to run proper.
If you don't want the pressure test, and only want to verify pump is working, then break into the fuel line somewhere convenient and see if gas spurts out when you are cranking the engine over. If it does, pump is working. If no gas comes out, line is plugged or pump is not working. To test for power to the pump, a mechanic would check for power at the fuel pump connector while the engine was being cranked.

Jan 12, 2013 | 1991 Nissan 300ZX

1 Answer

My 1981 mazda rx7 turns over but will not crank like it's not getting any fuel.

Check operation of fuel pump. Remove fuel hose and crank. Is there any pressure? Is there fuel coming out?
If not, then check fuel pump for power. If no power, then check any relays.

Nov 11, 2012 | Cars & Trucks

1 Answer

Won't start

remove the fuel inlet pipe suction till fuel comes. than crank the engine .once the fuel comes out ,connect the pipe. next remove the out-let pipe and crank the engine till fuel comes out.and also check the fitting at suction for any leakage,breakages etc...

Feb 29, 2012 | 1995 Ford Explorer

1 Answer

Cranks strongly, but won't turn over / start.

it might be the fuel pump take the output hose off of it and crank the engine and see if fuel comes out of the pump if it does the fuel pump is not the probelem. if it doesnt come out or if it slowly comes out than you need a new fuel pump

Dec 23, 2011 | 2000 Ford Expedition

1 Answer

When I try to crank my truck, it will turn over but will not crank. It sounds like it is out of gas. Some times it seems like it wants to crank but isn't getting any fuel.

replace the fuel filter if it hasn't been replaced in a while... then check to see if you hear the fuel pump come on when you turn the key, if no sound, check the fuses, fuel pump relay is on the firewall on passenger side, it should be the first relay closest to ac box, try to swap relays around if you still have nothing then replace the fuel pump

Dec 16, 2010 | 1996 GMC Sonoma

3 Answers

No fuel getting to throttle body / installed new fuel pump and filter / gas is in line but will not come out when turned over

are you geting power to the fuel pump?? On some vehicles the electric fuel pump primes when the ignition is switched on to acc (i.e when all the dash lights come on etc) and on other vehicles the fuel pump doesnt start untill you turn the ignition over to the "start" position. Id check the fuel pump was acutally getting power and go from there

Jun 30, 2009 | 1987 GMC Jimmy

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