Question about 1997 Chevrolet Blazer

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Engine won't start when fuel pressure is low or at zero.when iget fuel pressure it willstart and run till pressure drops under 45

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Try replacing the fuel filter (provided the pump is in working order)...
Best regards
Ck

Posted on Mar 06, 2011

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Why would my vehicle that is a 2006 Chevrolet 3500 express van with 6.6 Duramax engine be driving well and then all of a sudden drop to 45 mph. and then after 10 min. of sitting take off and drive fin


Not real familiar with your engine, but generally you have two coolant temp sensors. One just runs the dash gauge. the other speaks to the computer and acts sort of like a choke. If the computer thinks the engine temp is hotter or cooler than it actually is, fuel metering will be wrong. The more likely culprit is the low fuel pressure. I have even seen a bad fuel cap cause something like this, as these systems operate under pressure I believe.

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What year is it? Your symtoms suggest oil contamination from bad fuel pressure regulator.

Sep 02, 2014 | Cars & Trucks

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Engin start then switch off


First thing is check your fuel pressure using fuel pressure gauge. You may have faulty fuel pump. Let me know what did you find (fuel pressure between 40 - 45 PSI when engine is running if engine starts and turns off your pressure if pump is at fault will drop.

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My low pressure fuel pump on my e270cdi cut out under high load conditions.no pressure from the rear.all fault codes tell me the rail pressure is to low


Fuel pump relay is in cavity A in the rear SAM ( Signal Acquisition Module.) on the left hand side of the trunk behind a door.

When did you check the voltage..... you must read it while cranking or you will get a zero voltage reading.. The low pressure tank pump builds pressure to the high pressure pump and then shuts down until a pressure drop is sensed in the low pressure line and it then starts up again.

If rail pressure is too low, it often is the high pressure pump in the engine or the relief valve in the fuel rail. The tank pump is low pressure just to stop the tandem pump from cavitating by sucking too hard.

Mercedes can check the rail pressure and do an injector pressure drop to rule out a leaking injector.

If the tank pump is bad it will require replacement.

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1997 chevy k1500 won,t start cold starting fluid will start truck


I would check the fuel pump relay first. You should have some fuel pressure in the lines when you turn the key on. The relay is powered for 3 seconds to boost pressure until the engine starts.
The relay may not be working or the check valve in the pump may be letting fuel back into the tank which would cause the pressure to drop to zero when the engine is off. You should have at least 15psi with a TBI system and 35psi with MFI.

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1 Answer

Won`t start when cold


No such thing on your car.
The temp sensor tells the computer what the engine coolant temp is.
If it were faulty you would get a check engine light.
I would have the fuel pressure checked before and after you crank the engine. The pump relay provides power to the pump when you turn the key on to recover some of the lost fuel pressure after the car sits. The one way valve in the pump is supposed to prevent the pressure from dropping.
If the fuel pressure drops to zero it could take some time to crank the engine enough to get it back up.

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1 Answer

Fuel pressure drops immediately to zero when engine is shut off.


I am not really familiar with the setup there but I'd be looking for a second relay to kick the pump on when cranking.

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1 Answer

Engine power seem a miss when demand is needed


check your fuel pressure good chance that there is enough fuel getting there under light load but not enough under heavy load it should not drop below 45 pounds at WOT ( wide open throttle ) while driving under a load if it drops to low good place to start at the pick up screen in the tank or the pump itself

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