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  1. H

    1987 Silverado fuel issue

    One more crazy thing with connections. My temp gauge was acting up. It would flail about, wildly and then settle on maxed out. I cleaned the connection at the sender and now it reads the temp correctly most of the time. It still flails sometimes, but settles on the real temp.
  2. H

    1987 Silverado fuel issue

    Nope. It seems there are two on mine. A pressure switch by the distributor which keeps fuel supplied as long as there is oil pressure. That is apparently a backup for if the fuel pump relay fails. Then, there is the one for the gauge, which is down by the oil filter. Sure glad I didn't have to...
  3. H

    1987 Silverado fuel issue

    This time, after starting, I get no movement from the gauge. it just stays very high. Having trouble getting to the sensor near the oil filter, or even identifying it, for sure. PS: If I have found it, it seems to be encased in some kind of round, sheet-metal shroud. PPS: OK... all I did was...
  4. H

    1987 Silverado fuel issue

    Back to my oil pressure issue. I went to check the wire from the sending unit and I find that it has two wires in the connector, not one, as everybody says it should have if it is a "sending unit" for a gauge. Suggestions? PS: Last time I started the truck, the gauge was reading off-the-scale...
  5. H

    1987 Silverado fuel issue

    My next issue is that the oil pressure gauge maxes out after I turn the key on - before starting. Any ideas? PS: Actually, it stayed maxed-out after shutting the engine off, but I thought I saw it registering somewhat lower before I started the engine today. PS: I did drive the truck. No more...
  6. H

    1987 Silverado fuel issue

    Yep. It was the tank selector switch. Pump now comes on for a couple seconds with ign. to "run". Primed it a bit and it started instantly and seems to run just fine. Have not driven it yet. I dropped the tank twice and replaced a working fuel pump, along with getting towed home, before...
  7. H

    1987 Silverado fuel issue

    Well, kids.... it seems that maybe it was the tank selector switch all along. I pulled the switch and it would not make continuity between any of the lugs, regardless of switch position. So I sprayed DeOxit into it and worked it back and forth a bunch. Then I started getting continuity. I...
  8. H

    1987 Silverado fuel issue

    Been busy with other things the past couple of days. Further study has shown that the crank fuse should only see power when ign switch is in the "start" position. How could that fuse blow while driving, as that seems to have happened simultaneously with whatever is keeping voltage from reaching...
  9. H

    1987 Silverado fuel issue

    Shock and awe. Let it know who's boss.
  10. H

    1987 Silverado fuel issue

    I have that. Thanks. Too hot out there now to continue until evening. "Shade tree" mechanics don't work well when there's no shade tree.
  11. H

    1987 Silverado fuel issue

    Yes, now I remember where I was last fall on the tank selector switch. I had tried to pull it out of the dash, but the front, with the rocker part, broke off. Now, the rear part should come out, but the wiring seems too short to pull it. I think I have the back part of the switch mechanically in...
  12. H

    1987 Silverado fuel issue

    Yes, as YakkoWarner suggested, it's going to be different with 2 tanks. I'll try to find a schematic for the setup with 2. That selector switch is an obvious possible disruption point.
  13. H

    1987 Silverado fuel issue

    Now THAT'S a good idea! You're right.. it should only feed power to one tank at a time! I believe I tried looking at that switch last fall, and broke the mount. I think it's hanging inside the dash now. I'll look at it tomorrow. Finally, something new to go on. Thanks!
  14. H

    1987 Silverado fuel issue

    Yes, I recognize those charts. Seen them before. What I have decided to do is finish putting the tank back in place and re-connecting it and put in some gas. Then I might run a 12V line directly to the pump, bypassing everything, and see if I can get the thing to start that way. I just cannot...
  15. H

    1987 Silverado fuel issue

    The red test lead actually just goes right into the relay connector and should supply whatever voltage you provide. As I recall from my previous attempts last fall, that connection makes a bridge to another contact point in the relay, which should, in turn, run the pump. I now remember jumping...
  16. H

    1987 Silverado fuel issue

    When I follow the troubleshooting instructions found on this site for the fuel system, It says I should get an error code of 54 for a "failure in the fuel pump circuit". I didn't get that code. It also says there that there is a terminal for testing whether the fuel pump functions. I have a red...
  17. H

    1987 Silverado fuel issue

    I believe there was some debate back there about slapping wives. Whether to use open or closed hand or a mallet. You can review to find it. On the other hand(so to speak) I reviewed and recalled that I did have spark - would start with a prime. I think I'm back to trying the old ECM (which...
  18. H

    1987 Silverado fuel issue

    I'll definitely bear that in mind.
  19. H

    1987 Silverado fuel issue

    Well, all heck broke loose around my house last fall and I had to leave this project to sit all winter and spring. Now I'm back to needing to get this truck running. I'll review this thread, since I have forgotten a lot of where I was on this issue. I know I was in the process of jacking the...
  20. H

    1987 Silverado fuel issue

    OK. Thanks. I'll keep that in mind. I have an old ECM which would quit working when it got hot. I already tried putting that one back in and it didn't help, but that was before I found the blown crank fuse. On the other hand, I don't seem to get 12v to the fuel pump connector by the fuel tank...
  21. H

    1987 Silverado fuel issue

    The wire I broke off at the tank is a ground to the frame, so I'll still have to go ahead drop the tank to fix that. It's almost out anyway now. I put 12v to the red pigtail out of the fuel pump relay connector. It appears that it should be a direct test for the fuel pump, but I don't get 12v...
  22. H

    1987 Silverado fuel issue

    Anybody? I have tried looking up what a "crank fuse" does, but most references say that the engine won't crank without it. But mine DID crank without it - just no fuel coming to the TBI. Can't figure how that fuse relates to my fuel supply issue.
  23. H

    1987 Silverado fuel issue

    Update: I found the connector near the fuel tank and disconnected that to run a test on the fuel pump. Was feeling around the wires on top of the tank and felt one which seemed to run to an odd location on top of the tank. I pulled on it, lightly, and it popped loose. Dropping the tank to...
  24. H

    1987 Silverado fuel issue

    Update: Finally got back to this project. I found that the fuse I believe is marked "crank 3A"(hard to read) was blown. After replacing that fuse, I now hear the fuel pump relay activating about one second after turning on the ign key. I still have crank but no run condition. It will run on a...
  25. H

    1987 Silverado fuel issue

    I believe you are envisioning a vehicle with a tank in the rear. Mine has dual side tanks. Only the right tank is in use because the left one has a leak. [As an aside, my fuel gauge stopped properly registering when this fuel system problem arose. I get no change when changing to the left tank...

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