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1991 chevy s10 2.5 bad fuel pressure but have new fuel pump

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: 1991 chevy s10 blazer

Check the fuse under the dash. Did you replace the inline fuel filter? If not, you could loosen the line going into the filter then turn the key to the on position. The pump should run for about 2 seconds then the relay should kick off. Turn off the key for approx. 5 seconds then cycle key back on and the pump should cycle again. If you get a 2 second burst of fuel each time then the pump is cycling. Install a new fuel filter and check the grounded wire by the tank. Hope this helps. :)

Posted on Nov 03, 2008

  • 99 Answers

SOURCE: 1999 chevy blazer fuel problem

probably not fuel filter . probably going to have to remove the upper intake and replace the fuel injector spider(fuel inj assebly) if it is droping fuel pressure it is leaking into the upper manifold

Posted on Nov 30, 2008

  • 4088 Answers

SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

pippall
  • 1486 Answers

SOURCE: 1987 chevy S10 engine idle problem

relace the throtle air idle valve.The temp switch will allso cause this problem.

Posted on Jul 19, 2009

  • 139 Answers

SOURCE: fuel pump pressure specs

The fuel pump specs are 14 psi. and 20 gallons an hour.

Posted on Sep 08, 2009

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if you had the pump working, it should pump about a cup [ 8 oz. ] or more in 15 seconds. sounds like the pump is bad or the inlet screen is clogged. the pressure for this system should be at least 13 PSI. I wouldn't test it in a bucket of fuel as this is a fire hazzard. good luck.

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I have 91 Chevy s 10 pick up had the fuel pump


could be the lines stopped up. happends alot due to old gas tanks will have trash in the bottom of them an you let them run low to almost empty it sucks up all that trash. it will clog lines and also clog the fuel filter and or make your pump go bad. check it out.

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2 Answers

Fuel pump pressure specs


The fuel pump specs are 14 psi. and 20 gallons an hour.

Sep 08, 2009 | 1991 Chevrolet S-10 Blazer

1 Answer

Oil pressure switch


yes a bad oil pres switch can shut off the fuel pump also,but not very often

Sep 13, 2008 | 1991 Chevrolet Silverado 2500

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