fuel pump

  1. 97_Bourbon

    Fuel Pump not priming 5.7 vortec

    I've got a 5.7 Vortec Suburban ive been trying to restore. I got a new smp fuel injector, new top end gaskets and all that lovelyness. However, I went to go start it yesterday and it wouldnt start. It turns over but it sounded like no fuel. I turned the key over and nothing, not even a hum...
  2. 9

    Fuel gauge issue, possibly the "Fuel Level Sender Assembly"

    My fuel gauge is showing my tank on E. When the key is turned, the gauge flips all the way up to Full, then immediately drops back down. From what I've researched, the problem is most likely the "Fuel Level Sender Assembly." I'm getting a little confused because when I search for parts on...
  3. S

    96' L31 - Truck starts only during morning and night

    The truck runs fine, cranks instantly and will stay on and not fumble. But If I go run an errand such as groceries, it will not cooperate. First start, with the key forward the pump will prime itself and cutoff like normal. But If I try to do this during the day with the sun beating over...
  4. P

    Seating fuel pump into tank

    I successfully extracted the old fuel pump using the tilt bed method. Now trying to get the pump assy to seat into the tank. The challenge is that I can’t push down hard enough on the top of the fuel pump assy to compress the o-ring and allow the the large snap ring to be installed. Is there...
  5. C

    Fuel pump issues

    I recently bought a 1990 Chevy c3500 with the 5.7 and I am having electrical issues with the fuel pump. I have replaced the ecm fuse, ignition fuse, fuel pump relay, fuel filter, and fuel pump all for it to still not work. The fuel pump I bought is from Delphi and it has a ground wire that...
  6. D

    Fuel Delivery on Cold starts?

    So I have a 1996 C3500 with a 350 Vortec. I have an issue on cold start. It runs okay after starting, with a caveat of some engine rpm stumbling. It recently died on me while idling, and wouldn’t start back up, leaving me to tow it back home. Now its more of a crank no start as opposed to a...
  7. KCusick81

    Fuel pump? - Results of electrical testing at fuse box - What does this indicate?

    Good evening all, I'm in need of some help diagnosing the latest issue with my 1997 K1500 5.7. How it started: About a week ago, I was driving my daughter home from school. I stopped at a stop sign and my truck shut off. No spitting or sputtering. No warning, just shut off. The truck would...
  8. P

    Code 54/ LOW VOLTAGE TO FUEL PUMP RELAY

    Truck is throwing code 54 which is low voltage to fuel pump relay. I think it causes my truck to not start sometimes. Anyways what could cause this. I got a new relay (the piece that mounts on the top of the firewall) and it fixed it for a bit but I guess it came back. In need of some ideas as...
  9. P

    1998 K2500 5.7L - Hard Start/Low Power

    Vehicle 1998 GMC K2500 Suburban 4x4, 5.7L V8 Work Done New fuel pump, Tru-Grade brand, P/N D5331028 (With California emission. With Module Code GFN. Without Low Lubricity Fuel System Sender. Wiring Harness Included. Internal Strainer Included) New fuel filter Locking gas cap Concern I bought...
  10. A

    Kill switch, 1997 k1500 pickup

    Hello, I was thinking of adding a kill switch by interrupting the power between the computer and the fuel pump relay, which I believe is a dark green and white stripe wire. This dark green and white stripe wire is one of five wires going to the fuel pump relay, correct if I am wrong please: 1...
  11. Astro

    Fuel tank question.

    Hey all, was thinking of upgrading to the 98+ style fuel pump on my 96 because offroading and fuel cavitation is no bueno. Had a problem with that going down a bouncy steep decline over the weekend Has anyone done that here? Can I use my 96 fuel tank? What all would I need to change? I checked...
  12. J

    Tbi to carb swap help

    Hey guys I’m new here. I know this has been covered to some degree but it seems to be more related to trans problems. I recently did a motor and trans swap in my 1990 gmc c1500. I put a crate 350 and th350 in That I had from a previous project year ago. When I got the truck the harness was...
  13. TheTruckOfTheseus

    98 5.7 fuel pump intermittent no prime / dies while driving

    i’ve seen a lot of posts that have given me good ideas of where to start, but i have not seen anything exactly like what i’m dealing with. i hope i’m not typing too much, just want to give y’all every relevant detail so i have a ‘98 ecsb k2500 5.7 farm truck that i bought with ~202k miles and...
  14. D

    Replace Fuel Pump or Not Replace Fuel Pump?

    My truck is a 1989 Silverado with the original drivetrain. I don't know if the fuel pump has ever been replaced and the truck has 123,000 miles. I dropped the gasoline tank to reach a ruptured brake line that was replaced today. Would you replace the fuel pump or not replace the fuel pump? I...
  15. G

    fuel pump relay ground and power

    1997 GMC Yukon 5.7 vortec 4X4 This started 10 minutes or so after I left a car wash, it didn't spit or sputter just died on the road. After a fair bit of diag and changing the pump i discovered that pin 87 ( should just be constant power ) is also a ground to the body. I don't know how this is...
  16. T

    1996 k2500 low on power

    1996 k2500 5.7 fuel pressure is 60psi with key on engine off when it is idleing it drops down to 50psi and after i turn it off it will drop to 0psi. reason i checked fuel pressure is truck is low on power all across the rev range. is there anyway to tell if it is fuel injectors vs fuel regulator...
  17. J

    HELP- Fuel Pump

    I have an 88 GMC 1500 RCLB. Put new Delphi pump in 2 mos ago, along with a bunch more restoration items. Just put new alternator in; Truck was running great; I had about 1/4 tank of gas, and just filled it up. It sat for a few days without being driven, and I am in N Texas with temps over 100...
  18. C

    Starting Issue

    If this is the wrong place to post, I'm sorry I can never figure out any of these forums. So I have a 1998 vortec 5.7, and randomly about once a month, it will crank and turn over but then instantly kill itself. (I have a video but I can't attach it, If you want me to add you on snap, facebook...
  19. T

    1998 fuel pump lq4 swap

    I am working on swapping an LQ4 into my 1998 c1500 pickup and can’t seem to find anything on what high pressure fuel pump will work. From what I can tell the 98 was different than any other year. I have reached out to walbro directly and they do not have any info that will help. Does anyone know...
  20. LoCascio_Inc

    Aux Tank Fuel Sending Unit 15732147

    Is anyone familiar with this aux tank fuel sending unit: https://www.summitracing.com/parts/ado-ep1002 Or https://www.wholesalegmpartsonline.com/products/Chevrolet/Fuel-Tank-Sending-Unit/2778335/15732147.html Will it have the proper depth to fit a normal 25 gal tank? This unit appears to be...
  21. R

    1994 Suburban 1500, 8 volts at fuel pump

    I'm back again with my never ending Suburban project:banghead: 1994 Suburban 1500, 350 TBI. I put in a new Delphi fuel pump, and the truck ran great, started easily and consistently. The truck sat for 2 weeks, it's now a no start, and only 8-8.5 volts at the fuel pump connector. Code 54. Can't...
  22. Angelo

    LP bypass to Walbro FRB-5

    For a 1996 6.5L, I got the LP relay harness from Leroy diesel that "bypasses" the ops, and plan on switching the fuel pump to this Walbro FRB-5. I found Leroy diesel also sells this LP bypass kit - but all it is 2 connections for the hard lines to a 3/8 barb and it'd run $29 after shipping. Does...
  23. F

    Eating fuel pumps

    I posted in the towing section because that is the main duty of the truck. 1997 K3500 7.4l 4l80e stock except Five O Motorsports injectors and Gibson short header and flowmaster 50 series I keep burning fuel pumps. 500 to 1000 miles (roughly). I bought the truck with a hole in the bed for...
    • Franksmith
    • Thread
    • fuel pressure fuel pump fuel system
    • Replies: 12
    • Forum: Towing
  24. 89Sport16

    LSX Fuel Pump not Priming

    05 5.3 in an 89 C1500, returnless fuel rail with corvette regulator. I did the swap two years ago and used the newer 98 AC Delco pump in the tank. About a month ago, the engine started stumbling on startup, then one day it wouldn’t start and the fuel pump quit priming. I’ve checked the grounds...
  25. A

    Abundant Fuel Pressure

    Happy new year to you all! I've concluded that my engine is getting 'flooded' with gasoline. There used to an MSD ignition system installed that created a more powerful spark. This has been disconnected, I'd like to keep it this way in order to pass inspection. However the old modified fuel line...

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