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1999 5.7 vortec fuel pump!! what does the black plug control?

Black fitting on top broke off what does this control?

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  • 164 Answers

Looks like the black plug is the fuel sender unit that will tell you how much gas is in the tank. The white plug goes to the pump.

Posted on Mar 16, 2019

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Posted on Jan 02, 2017

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SOURCE: 97 z71 vortec 5.7 replaced fuel pump.getting fuel but won't start

The # 5 cylinder is miss firing. not getting fuel. Could the injector just be stopped or the crankshaft sensor in gone.

Posted on Jul 24, 2009

  • 279 Answers

SOURCE: 1999 Chevy Cavalier Can not remove the quick

You can use a pick to remove the plastic clip,And use a fuel line disconnect tool to release to line.If you do not have that tool you can get one at advance auto parts.Be patient it may take some time to remove it.

Posted on Jan 31, 2010

  • 7 Answers

SOURCE: 1999 5.3 vortec silverado 4x4. Engine intermitient hard start.

Had a similar problem and turned out to be a fuel regualtor.
Be careful with the little o-ring. Tricky little devil.
There may be residual pressure in the line so be careful you don't take a shower in gasioline.

It was hard to start after warm up. Rough idle until driving. Then on shut off it was hard to start.

Posted on Sep 04, 2010

  • 30 Answers

SOURCE: 1999 GMC Savana 2500 fuel

there is 2 one is for the evap fuel tank pressure sensor...and the other is the pump module...the module one should be 4 wires purple gray white and pink i think..just 2 of them are for the actual pump...run a test lamp on them...you should have power to it for 5 seconds ..when the key is 1st turned to the run position..thats the prime siglal to the pump..

Posted on Apr 22, 2011

rfoulds85
  • 128 Answers

SOURCE: hotmail.comhoneed to know where the

fuel pump relay is behind a plastic panel inside the passenger side glove box in side the truck.

Posted on Apr 29, 2011

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1995 gmc jimmy 4wd 4.3 vortec when hot dies and won"t start, replaced plugs wires cap rotor, oil pressure switch, camshaft and crankshaft sensors, ignition control module. still getting spark and over...


The problem is either your fuel pump relay is overheating our your fuel pump is over heating. They also have the problem with the wire connector on top of the fuel pump melts. This is a known problem with them, when you but a new fuel pump they give you a new connector and a service bullentin regarding this problem.

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Pull the plug and inspect the color, are any of them whitish, could be coolant leaking into the combustion chamber,

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Starts runs realy rough then dies put new fuel


It sounds like you already solved your problem. Attach fuel gauge to fuel rail pressure line and monitor for fuel pressur (above 30 p.s.i. @ crank). If pressure low suspect pump. If pressure o.k. but dies out and pressure drops but restarts, check oil sending switch as this controls fuel pump. Computer primes pump for start, then oil sender powers up pump for normal operation. Check for oil leaking at terminals on sender. Also check plug connector at fuel sender on tank as they are known to melt and fail. If fuel not problem, check for spark as ignition module failure is common. Have obd2 diagnostic run to check for codes as this may help with diagnosis.

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it looks like you need more fuel to start your engine check for a bad fuel pressure regulator, measure the pressure it should have 55 psi less wont start cold

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I HAVE ENOUGH FUEL PRESSURE TO RUN WELL, BUT NOT ENOUGH TO START


Then your best bet is to change the fuel pump. It must be too weak. You could have the pressure tested first, if you want to be sure. It has to be either that or a faulty idle control sensor.

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1999 chevy blazer wont start


THE FUEL PUMP IS BAD.

if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.

and i doubt that you are seeing enough fuel pressure to run a vortec engine.

low fuel pressure equals a non running vortec

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I have a 4.3 vortec engine, a new fuel pump and i


mcdevito75 here, You"ll have to trace the fuel lines from the gas tank to the carb. look for kinks, breaks, beds in the fuel lines. Also change the gas filter.

Feb 21, 2009 | 1999 Chevrolet Silverado 1500

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1998 Chevy tahoe Hard to start when cold


replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump

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1 Answer

Priming fuel system on a 8.1L diesel engine 2001chev 1 ton dual


Well, one problem is, if its an 8.1, its not a diesel. The 8.1, or Vortec 8100, is a gas engine. The DuraMax is a 6.6 engine. There is usually not a priming system on a gas engine, because the fuel pumps will usually get it through the smaller filters used quick enough you dont need them. However, if it is a DuraMax engine, then right on top of the fitting where you mount your diesel filter, there is a primer pump and an air bleed valve. What you do is, open up that air bleed valve ( its a little black plastic octagon shaped thing on the top of the filter mount) then you pump the primer (the silver button looking thing) until you get diesel squiting out the air vent without too many air bubbles or gurgles.

Jan 17, 2009 | 2001 Chevrolet Silverado 2500HD

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