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What causes a 1998 gmc sonoma 4.3 v6 to loose fuel prime while sitting overnight

What causes it to loose fuel prime while sitting overnight?

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Fuel Regulator Bleeds Down

Posted on Apr 25, 2013

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Posted on Jan 02, 2017

emissionwiz
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SOURCE: 85 ford diesel 6.9

Most common cause is a air leak into the fuel system at the filter bleed valve.

Posted on Sep 20, 2008

  • 1 Answer

SOURCE: 1998 gmc sonoma push button 4x4 busting diaphram vacuum actuator

On top of the transfer case is a vacuum switch with 3 vacuum lines connected to it. This switch controls when vacuum is applied to the vacuum actuator. This switch can fail partly and allow fluid from the transfer case to be sucked up into the vacuum lines and anything connected to them as well. When you replaced the actuator before, did you notice any oily fluid inside of it?

Posted on Dec 23, 2008

  • 3 Answers

SOURCE: 1998 olds bravada 4.3 v6

there is a fuel pressure regulator on the back of your injectors, change it, its a 13 dollar part, after you do that, buy a fuel pressure guage, hook up the pressure guage, turn the key to on possition, prime the like a couple times like you would do with a new pump, check the pressure it should be any where from 58 LBS to 62 lbs of pressure in the like, if its any lower the 58, you need to change your pump, with out 58 lbs of pressure the injectors dont get the correct pressure in each purge, hence the crank with no start.. you seem to know enought about pressure n stuff like that so u should get it

Posted on Mar 26, 2009

  • 71 Answers

SOURCE: where is the fuel shutoff switch on a 1996 gmc sonoma?

no fuel shut off switch on pickups that i know of possibly bad fuel pump find your red bypass wire at relay to test pump

Posted on Mar 29, 2009

  • 21 Answers

SOURCE: what would cause a fuel pump to overheat

On many vehicles with electronic fuel injection, the pump is located in the fueltank and the fuel actually cools it, chronic low fuel levels will cause issues here on an older pump BUT look elsewhere for thr PRIMARY cause... plugged fuel filters, bad pressure regulators and injectors. You havent mentione that it has affected engine performance so look to the fuelpath... filters and lines... suspect your source of fuel as the root cause for plugged lines and filters. You could also simply have a bad pump... it happens in any case the vehicle IS 9 years old and if the cause is found to be other than the pump itself, replace the pump. it is an electric motor driven high pressure pump. The Motor is what is overheating, and this causes the windings on electric motors to break down... which will result in premature failure. replace it while it is running and not when it dies with you in traffic or away from home and end up having to pay for a tow

Posted on Apr 13, 2009

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My 1998 gmc snonma votec wont start it cranks and cranks and after about 20 mins it starts after that i can shout it off and it will fire back up fine then a day will go by and it dose the same thing


You have to check the fuel pump pressure to make sure it is supplying sufficient fuel pressure..Try turning the switch to on but do not start..now listen for the fuel pump to prime the system..it should run for 4-5 seconds the shut off..now try and start..if it is fully primed it should start...note although you are getting some gas dosent mean the pump is ok...sometimes it starts to go bad and then all at once it will let you down for good...have it checked out..good luck

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1 Answer

Why will my 1998 chevrolet cheyenne not start unless primed after sitting overnight


by primed are you supplying a fuel source if so then the car is not getting fuel to burn. this indicates your fuel pump is bad and needs replacing and change the fuel filter also. the reason the pump won`t work sitting overnight is that the pump can`t build up enough pressure possibly because the fuel pressure is not being held, but after the first start up the system can maintain enough pressure to start through out the day. you can have the fuel pressure and volume checked with a gage when the problem occours to verify.

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What is standard running fuel pressure on 4.3L v6?


Nothing wrong with fuel pressure should be fine. Pressure should not bleed off when vehicle not running that is probably why you have to crank for a while before it starts. I would check all fuel line connections from tank forward as you have a pressure "leak" somewhere along the line to loose fuel pressure.

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No power to fuel pump 1998 sonoma


by turning the key to the ON position you should hear the fuel pump start to prime for 5 seconds. If not heard replace the oil sensor. If heard pumping replace the fuel pump relay instead

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Try changing the fuel lines, if they are cloged from debris that could be the cause.

Nov 07, 2009 | 1994 GMC Sonoma

1 Answer

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if you don't have any leaks it is probably the check valve in the fuel pump if you just cycle the key three times by turning key on and wait 7 seconds and turn off and wait 10 seconds each cycle it will start easier if that works and it starts fine the problem is the check valve in the fuel pump

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checked fuses , #9 fuse for fuel pump was loose.

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