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Floods out fuel pump is fine intake gaskets have been replaced can it be a fuel pressure regulator

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Hello that is what this problem sounds like possible internal diaphram rupture what i would do take a fuel pressure reading at the fuel rail at the shrader valve looks like a valve stem compare with specs for allowed pressure for your vehicle goodluck please rate

Posted on Sep 19, 2008

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There is a vacuum line off the intake plenum that goes to a check valve and a return fuel line off the fuel regulator to another check valve. Both connect through a "T" and go to the EVAP can by the f


If you are getting Fuel in the vacuum line, it sounds like you could have a bad fuel pressure regulator. Check the line that comes off the Fuel pressure regulator. use a hand vacuum pump see if fuel is being pulled out of the regulator.Replace regulator if you find fuel
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My 1994 buick lesabre misses out


Check the fuel pressure. It will tell you if the pump, fuel filter, and fuel pressure regulator are all good. Fuel pressure is critical on fuel injected engines.

Check your spark plugs for wear or the wrong gap.

Another possibility is a vacuum or air leak. Check all vacuum hoses and the intake manifold gasket. The GM 3.8L engine is prone to lower intake manifold gasket failures. Sometimes the upper intake gasket, too.

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YO HAVE A VACUM LEAK AT INTAKE MANIFOLD GASKET OR HOSES THATS YOUR PROBLEM USE A CAN OF CARB CLEANER TO HELP FIND LEAK BY SPAING ARROUND INTAKE OK HOPE THIS HELPS BUT IM SHORE THATS YOUR PROBLEM RESON YOU REPLACE YOUR FUEL PRESSURE REGULATOR LEFT INTAKE LOSE OR PINCHED GASKETS OR LOSE HOSES TRY THAT OK

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Where is the 2002 corolla fuel pressure test port


LOOK ON THE FUEL INJECTORS RAIL YOU SHOULD SEE A BLACK CAP THAT LOOK LIKE A TIRE AIR PRESSURE STEM REMOVE THE CAP AND FUEL PRESSURE REGULATOR IS THERE

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1 Answer

Car ships replaced wires plugs o2 sencer sometimes acts like it is flooding run fine on open road.


If it acts like it is flooding while idling, but it runs fine on the road, it could be running too rich and flooding it out due to leaking injectors, bad fuel pressure regulator, or excessive fuel pressure.

I would start by replacing the Fuel Pressure Regulator since it doesn't cost as much as the injectors.
Check your fuel pressure using a Fuel Pressure Check Gauge to see if the fuel pressure regulator is maintaining the proper pressure.

Vacuum is attached to the Fuel Pressure Regulator to control system pressure. When the fuel pressure regulator is not functioning properly it causes the fuel pressure to be above normal operating pressure. This condition causes excess fuel to be injected causing a rich mixture that produces black smoke.

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The Vortec engines were notorious for those kind of problems. The problem will be under the upper-intake manifold, and the fuel injector assembly will either have a cracked plastic fuel line running out to one or more of the fuel injectors, or the fuel pressure regulator that is located on the end of the fuel injector assembly is faulty or it has detached from the fuel injector assembly. Either way the lower intake manifold will be flooded with fuel anytime that the fuel pump runs.

There were two types made, the first type had fuel lines that connected to the lower intake manifold, and then from the metal fittings the fuel line turns into plastic and runs inside the lower intake manifold and under the upper-intake manifold where it runs over to the fuel injector assembly, and this type can really flood out an engine when it becomes faulty.

The second type had metal fuel lines running over the upper intake manifold and they connected to the top of the fuel injector assembly, however, under the upper-intake manifold there are still plastic lines to the fuel injectors and also the fuel pressure regulator that could be faulty and cause the engine to severely flood.

The upper-intake manifold is not that difficult to remove, and after you remove the upper-intake manifold then (replace the fuel lines to the fuel injector assembly if it is the second type) turn the ignition to the "Run" position and when the fuel pump runs you should see where the fuel is leaking/spraying from, and it will most likely be a large high pressure leak from a ruptured plastic fuel line.

Let me know if you require any further assistance.

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1999 chevy silverado 4.3 new plugs,wires,battery,belt,fuel pump,fuel filter. wont start in the morning. turns over just very hard to start. once started runs and starts fine, if truck sits for an hour wont...


I just replaced the fuel pressure regulator and now I am hearing a vibrating noise from the fuel line under the truck. What do you think the problem is.

Jan 03, 2010 | 1999 Chevrolet Silverado 1500

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Flooded intake


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92 S-10 4.3 ltr seems to be flooding


The fuel pressure regulator may be failing. If your engine code is "W" the regulator is under the upper intake manifold. You may replace the entire injector package or just the regulator.

DORMAN regulator Part # 55162 about $40
ACDELCO CPI injector Part # 2171431 about $400

These parts may last slightly more that a year if you are lucky. I carry an extra regulator and manifold gasket at all times.


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2 Answers

My truck will not start. i have a new starter, alternator, fuel filter fuel pump, mas, air filter. any other suggestions. its fine once its started. i spay choke spray in it to get started.


I have had similar problems and had to replace the fuel pressure regulator. It's a major expense because it sets below the diaphram in the intake manifold. Ask your mechanic about it, it may be the issue. I would get about 30,000 miles between replacement, I've replace it 3 times since purchasing the 2000 chevy blazer new, first one was under warranty.

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