Fuel

650

Asked by jims74camaro Jan 21, 2020 at 07:50 PM about the 2004 Chevrolet Suburban 1500 4WD

Question type: Maintenance & Repair

Turn key to on position 4 times and no fuel
pressure. 4th time I listened to see if I could hear
pump and I could hear it. But it sounded a little off
possibly. Then tried to start it and it took 3 times
before it would start and run. When running it ran
pretty rough at first. Even after running for a minute
it seemed a little rough. While running fuel
pressure was 50psi. This is a flex fuel 5.3 liter
engine. Shut engine off. Tuned key to on position
again 3 times. This time it went up to 50psi. Could
the check valve in the fuel pump be bad and
bleeding back? And fuel pump needs replaced? Or
is there something else I should check?

6 Answers

650

And...I looked at it again last night. I found a part near the ABS unit that 2 different sized fuel lines go to. Small line in from the tank and big line out to the engine. What is this part? Inertia switch off or cut off? And could this be my problem?

650

After doing some online investing I found out that that part is not the inertia switch. It is the FCS (fuel composition sensor) and I'm assuming since there is no code it should not be the problem. Is that a correct assumption?

650

I guess I'm doing this wrong or there is nobody answering questions anymore. Last question...could it be the fuel regulator?

650

Well...it's not the fuel regulator. I replace the fuel regulator. It started right up and seemed to run good. I switched around some relays and cleaned terminals too. The fuel pump sounded better. I drove it around some and everything seemed ok. Let it sit a couple days. Now it's not starting at all. I will start all over and check fuel pressure first. But it would be nice if I could get some input on this. It's been 5 days and no response. I must be using this wrong?

650

Well...I guess I will keep posting till I get some answers or figure it out on my own. Maybe this will help someone else eventually. I have now replaced the fuel regulator and I just did the fuel filter. Still no fuel pressure! The pump cycles on and off. Now I'm going to disconnect the fuel line just before the fuel filter and see if I'm getting fuel pressure there. I will let you know the out come.

Your Answer:

Suburban

Looking for a Used Suburban in your area?

CarGurus has 530 nationwide Suburban listings starting at $5,000.

Postal Code:

CarGurus Experts

  • #1
    Andrew Olsen
    Reputation
    3,080
  • #2
    JimO65
    Reputation
    2,390
  • #3
    Rowefast
    Reputation
    2,130
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Yukon XL
14 Great Deals out of 708 listings starting at $9,999
Used Chevrolet Tahoe
16 Great Deals out of 785 listings starting at $7,499
Used Ford Expedition
21 Great Deals out of 631 listings starting at $5,999
Used GMC Yukon
9 Great Deals out of 930 listings starting at $6,900
Used Cadillac Escalade ESV
9 Great Deals out of 162 listings starting at $8,950
Used Cadillac Escalade
20 Great Deals out of 448 listings starting at $5,000
Used Chevrolet Silverado 1500
167 Great Deals out of 7,420 listings starting at $6,995
Used Lincoln Navigator
6 Great Deals out of 296 listings starting at $16,990
Used Toyota Sequoia
5 Great Deals out of 59 listings starting at $19,990
Used Ford F-150
305 Great Deals out of 13,473 listings starting at $3,888
Used GMC Sierra 1500
141 Great Deals out of 7,842 listings starting at $4,944
Used Chevrolet Silverado 2500HD
22 Great Deals out of 1,590 listings starting at $5,990
Used Dodge Durango
53 Great Deals out of 1,850 listings starting at $6,987
Used Toyota Sienna
42 Great Deals out of 616 listings starting at $2,499

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.