I have a 1995 s-10 Chevy Blazer with a 4.3 vortex engine,4wheel drive,auto trans. My question is why won't it start ? The only way to start it is to prime it first with gasoline or carb cleaner.

Asked by Oct 29, 2015 at 06:18 PM about the 1995 Chevrolet Blazer 2 Door LS 4WD

Question type: Maintenance & Repair

My 1995 s-10  Chevy Blazer  won't  start  without priming with gasoline or carb
cleaner.it has 4.3 vortex engine w/4wheel drive and an automatic trans. I've  
tested the fuel pressure and only get about 40psi. I've read it needs to be
between 55-60psi? What would cause the fuel pressure to read so low? How
can I  fix it? Any help is appreciated.  Thanks

2 Answers

16,925

First step is fuel filter, next fuel pump. Last is regulator but when it goes bad it leaks fuel into the engine and floods it, starter fluid would make it worse

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10

You could be having a fuel presser regulator leak down, with your fuel pressure gauge connected, you can jump the fuel pump wire at the relay 87- to 85 I think or just turn the key on and cyclical the key on - off (4 times) leave it on for 10 sec at each time , check the fuel reading still under 50psi? No start condition for the low psi or will tremble and die out. Replace the fuel filter only $15 doll- hairs, check if your getting a restriction and a fuel psi reading if not on spec.Next .... most likely the pump is going bad or the ground wire connection. I would add a secondary ground wire to the fuel pump ground wire and splice it in, replace the pump! Make the ground wire close to the pump like a under body part , polish the metal with sand paper and add a bolt to attach grounding wire to with new fuel pump. gives you better fuel pressure as the pump will run with less resistance to ground, giving it more use of the power provided, it's a good step. hope you get it.

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