Question about 1998 Chevrolet K1500

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Hard cold start.I don't think it is priming engine. I changed filter,checked pressure,52 to 56 lbs.. starts when I prime it. The pump seems slow to reach pressure. Dose this truck have a fuel pressure regulator and could this cause trouble? Is it more likley the pump?

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  • Master
  • 553 Answers

To your first question, not that I'm aware of unless it's built into the pump. Second question, the slow building of pressure would indicate either a bad pump or obstructed inlet to the pump but it takes a lot to plug up the sock on these pumps.

Posted on Jul 14, 2010

  • 1 more comment 
  • Richard Jul 14, 2010

    Thanks for your answer, II was hopeing not to drop the tank. But it is the next place to look. One other question, How dose the engine prime work. ? sensors and such . I find this to be confuseing? some spelling.

  • jonesspammai Jul 14, 2010

    As I understand it depends on if it's throttle body fuel injection or multi-port fuel injection. With throttle body there is a soleniod with multi-port fuel injection there is none that I know of because the fuel is delivered straight to the cylinder.. The main reason for priming is to get fuel to through the intake quicker.

    I had a thought while typing this, have you checked the battery this could be caused by a bad cell. The reason it'll start when primed is because the batteries voltage hasn't dropped off to much before the fuel reaches the cylinder and you still have enough spark. If you take it to the auto parts store and have it checked it might save you pulling the tank.

  • jonesspammai Jul 14, 2010

    A bad cell would also account for the slow fuel pressure build up since the lower voltage would cause the pump to run slow.

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2 Answers

1999 blazer only starts when primed and then wont start after sitting


Black smoke is usually extra fuel, but you say you are priming it to start so that could be why.
Have you checked fuel pump pressure before and after cranking ?

Mar 04, 2013 | 1996 Chevrolet Blazer

1 Answer

Fuel filter or pump. will start but will not continue. gage show 55 lbs of pressure when start, none when not key on.


Sounds like a pump. You should have 43 lbs of pressure after system is primed by turning key to ON. Pump will run for 5 seconds and shut off if engine is not running. It should hold pressure for 30 minutes with just a few lbs drop. If not, it is the check valve, internal to the pump or the fuel pressure regualtor on the fuel rail. Hardly ever the latter

Jun 23, 2011 | 2004 Ford Explorer

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My 2000 ford contour wont start. Engine cranks, but seems no spark. I checked plugs and coil. Fuel pump kicks on and shuts off after primed. It just got harder and harder to start, finally it wont start.


Have you changed the fuel filter.

Your pump may be priming but the pressure could be against a clogged filter.

You might want to check the fuel pressur at the rail.
It might be a fuel pressure regulator problem

Oct 13, 2010 | 2000 Ford Contour

1 Answer

Changed fuel filter checked fuel to seeit if works seems when i prime it starts don,t know switched relay fuse


Hi!!
Check fuel pump pressure. I believe that is time to replace it before it quits.
Good Luck! Don't forget to rate this post!!

Sep 20, 2010 | 1995 Dodge Caravan

1 Answer

Started ran for awhile then died an wont start


Start with the simple and replace your fuel filter, a dirty filter can cause your engine from starting. At worst, your fuel pump has failed and will need to be replaced. Before replacing the fuel pump, inspect all the fuses and wire leads from the fuel pump harness. Note: that the ground wire is separately grounded at the frame, so inspect that for any damage due to corrosion.

You need 3 things.
Compression
Good hot blue spark to all plugs.
Good gasoline and proper fuel pressure. 63-64 lbs.
If you have all 3 then move on to injector pulse to all injectors. I think each injector is on a seperate driver on that one. Check for pulse to all of them.

You may be weak on fuel pressure, even a couple of lbs low on a cold start will cause a no start. Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems. One test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test, here is the guide lines on testing.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure. Later V6 and V8 gm engines should have 60-66 fuel pressure.
* Cold start should be 64-65 lbs of pressure. If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
* Engine running should be 60-66 lbs pressure depending on engine load.
* Full pressure with return pinched off should be 75-85 or more. and if it has a fast leak down after shut off you have a leak.

The 75-85 is only a check on the capable full pressure of fuel pump. If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.

Mar 18, 2010 | 1999 GMC Sierra

2 Answers

When starting from cold there seems to be no oil pressure . Light on and no indication on the gauge . Will come up after a short while or reving it to 85 psi and runs normally after that . Engine no...


is the oil level correct?
is the oil the right grade for the car and the conditions?
is the oil filter an OEM or cheap aftermarket unit?
It sounds like the oil pump is loosing prime, so it could need replacing or it could be the oil type or a cheap filter that is fitted. If after you start it and rev it once it gains enough pressure straight away then i wouldn't worry for now, the back pressure from the pistons is pushing the oil through the pump to prime it, but keep an eye on it.

Jan 12, 2010 | 2001 Isuzu Trooper

2 Answers

Hard to start


Fuel pump is a possible cause but I would check the ignition timing first.

Jun 30, 2009 | 1986 Toyota Pickup 4WD

4 Answers

Engine wont start without priming with gas first, then runs well


i have the same problem on a 98 jimmy 4.3 4x4.
i replaced the fule pump and have good pressure.
new wiers & coil (good spark) no MIL & no codes.
will only start when primed. it will run & drive all day
with no problems.
but once it has been turned off (warm or cold) i will
have to prime it once again to start it.
i have another engine that was in it before it spun a bearing.
it ran fine so i know all parts are good.
i swaped the mass air flow and throttle body but i still have
to prime it everytime to start it. am i forgetting something?
should i swap out the intake with the injectors?
any help would be sweet. thanks.

Apr 28, 2009 | 2000 Chevrolet Blazer

3 Answers

1998 olds bravada 4.3 v6 vortek 4 door 98000 miles we got not prime from the fuel pump so we switched the ignition switch, now we have prime but no crank, battery tested at 12.4 and the car has fuel, the...


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

Jan 19, 2009 | 1999 Oldsmobile Bravada

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