fuel leak down - Car Troubleshooting


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upmaine
User

Jul 21, 2010, 11:27 AM

Post #1 of 5 (2292 views)

fuel leak down	Sign In

I have a 99 chevy s10 blazer with a vortec 4.3 and fuel system is having a leak down. If I start the balzer within 20 minutes of it being turned off it will start ok but any longer than that it takes several tried before it will start so i got a pressure gauge and as soon as i shut it off the pressure starts to fall. I replaced the fuel pump 14 months ago. will the fuel pressure regulator cause this type of leak down and can the fuel pump also cause this. I was not sure if the fuel pump had some kind of valve that held fuel pressure. Is their anyway to figure out if it's the fuel pressure gauage with out removing the top part of the intake and to figure out if it's the fuel pump causing this.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 21, 2010, 11:37 AM

Post #2 of 5 (2290 views)

Re: fuel leak down	Sign In

That's easy. Just pinch off the feed line after building pressure and it it holds then, the fuel pump is the problem. If not, the problem is forward of that point.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Hemi Guy
User

Jul 21, 2010, 2:10 PM

Post #3 of 5 (2282 views)

Re: fuel leak down	Sign In

Do yourself a big favor guy. Get a suitcase of Becks this weekend and do the modification below. Vortecs are just one pain in (you know what)

after the other. As soon as you fix one thing the poppets will be leakin again.

http://members.shaw.ca/...ticking%20Poppet.htm

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 21, 2010, 2:38 PM

Post #4 of 5 (2277 views)

Re: fuel leak down	Sign In

Interesting procedure. I don't know that I would dive into something like that just yet. As a rule I don't see that many problems with the injectors although they should be pressure cleaned occasionally. I drive one myself.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Hemi Guy
User

Jul 21, 2010, 3:05 PM

Post #5 of 5 (2274 views)

Re: fuel leak down	Sign In

(Quote) Interesting procedure. I don't know that I would dive into something like that just yet. As a rule I don't see that many problems with the injectors although they should be pressure cleaned occasionally. I drive one myself.

I drive a 2007 Infinity G35X. It's got 519.641 miles on it. I wish I had a nickel for every leakin poppet valve or failed pressure regulator (spider) I've seen on a Vortec. If I did I'd buy a fleet of Infinities.

As one pro to another. Swap it out buddy.

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