Author Topic: 87 tbi fuel pump issue  (Read 5448 times)

Offline R10dailydriver

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87 tbi fuel pump issue
« on: May 11, 2018, 06:05:46 PM »
Hey guys I have an 87 R10. My fuel filter went out one day so I swapped it out with a new one and the pick up fired right up and continued to run/drive fine for a few hours until it randomly killed while idling. I've replaced the fuel filter again, fuel pump, fuel tank selector valve, fuel pump relay, and have even tried hooking jumper cables to the battery incase it wasn't getting enough power but I still can not get the pump to turn on. I'm stumped.


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« Last Edit: May 11, 2018, 06:16:20 PM by Irish_Alley »

Offline Irish_Alley

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Re: 87 tbi fuel pump issue
« Reply #1 on: May 11, 2018, 06:19:05 PM »
have you checked your fuses? (ecm 2, if memory serves me right should be it)
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Offline Rapid Roy

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Re: 87 tbi fuel pump issue
« Reply #2 on: May 11, 2018, 07:12:53 PM »
Welcome
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Chevy by Choice

Offline VileZambonie

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Re: 87 tbi fuel pump issue
« Reply #3 on: May 12, 2018, 07:10:02 AM »
Hey guys I have an 87 R10. My fuel filter went out one day so I swapped it out with a new one and the pick up fired right up and continued to run/drive fine for a few hours until it randomly killed while idling. I've replaced the fuel filter again, fuel pump, fuel tank selector valve, fuel pump relay, and have even tried hooking jumper cables to the battery incase it wasn't getting enough power but I still can not get the pump to turn on. I'm stumped.


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What makes you think your issue is fuel delivery? Hook up a fused jumper wire from B+ to the pigtail on the fuel pump relay. This will turn the pump on.
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Offline Irish_Alley

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Re: 87 tbi fuel pump issue
« Reply #4 on: May 12, 2018, 03:34:54 PM »
also did you ever mess with the fuel selector switch in the dash? but stop throwing parts at it (not sure much is left to replace) listen to vile and we'll get your truck running again
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline R10dailydriver

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Re: 87 tbi fuel pump issue
« Reply #5 on: May 14, 2018, 03:10:56 PM »
As far as replacing the switch on the dash no but I figure that will be the next thing to replace. Also, I know it's fuel related because I've disconnected both fuel lines from the TBI and can't get fuel to come out. Also, can't hear fuel pump turn on.


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Offline bd

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Re: 87 tbi fuel pump issue
« Reply #6 on: May 14, 2018, 04:55:09 PM »
Hook up a fused jumper wire from B+ to the pigtail on the fuel pump relay. This will turn the pump on.
Rich
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In other words... if people learn by making mistakes, by now I should know just about everything!!!
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Offline R10dailydriver

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Re: 87 tbi fuel pump issue
« Reply #7 on: May 14, 2018, 06:41:12 PM »
Ok I'll give it a shot in the morning and let y'all know what happens. Thanks btw


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Offline R10dailydriver

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Re: 87 tbi fuel pump issue
« Reply #8 on: May 15, 2018, 01:27:15 PM »
When you say go from the battery + to the relay pigtail. What am I splicing into exactly on the pigtail? Is there a reference? I've tried youtubing it and I've got nothing


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Offline ehjorten

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Re: 87 tbi fuel pump issue
« Reply #9 on: May 15, 2018, 01:33:59 PM »
There is a fuel prime wire coming off of your relay.  It should be a red wire and is only a few inches long with a connector on the end of it.  That wire is an override to the signal wire coming from the ECM to control the fuel pump relay.  If you jumper that, it will make the fuel pumps run.
-Erik-
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Offline R10dailydriver

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Re: 87 tbi fuel pump issue
« Reply #10 on: May 15, 2018, 02:17:28 PM »
Right on, thank you. If that works then what does it mean as far as what I'll have to do to fix the problem?


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Offline bd

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Re: 87 tbi fuel pump issue
« Reply #11 on: May 15, 2018, 03:53:30 PM »
The test will indicate on which side of the fuel pump relay (control circuit or fuel pump feed) the failure is.  Install a temporary, 20-amp fused jumper between battery positive and the red pigtail off the F/P relay.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline Captain Swampy

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Re: 87 tbi fuel pump issue
« Reply #12 on: May 30, 2018, 10:08:57 PM »
If the pump runs with the fused wire connected to the jumper terminal, the wiring to the pump and the pump itself are good. You would check fuses and the fusible link on the firewall.
1987  350TBI 700R4  4X4  4.56 gears  33" BFG All Terrain


http://forum.73-87chevytrucks.com/smforum/index.php?topic=32209.0

Offline Captain Swampy

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Re: 87 tbi fuel pump issue
« Reply #13 on: May 30, 2018, 10:14:28 PM »
The red wire is where you supply fused power. The relay is on the passenger side firewall. The other 2 pictures are the fusible link that needs to be checked. It supplies power to the fuse box. The 16 means it's a 16 gauge fusible link. It's hard to see but the lighter color wire (the fusible link) is melted.
« Last Edit: May 30, 2018, 10:19:17 PM by Captain Swampy »
1987  350TBI 700R4  4X4  4.56 gears  33" BFG All Terrain


http://forum.73-87chevytrucks.com/smforum/index.php?topic=32209.0

Offline R10dailydriver

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Re: 87 tbi fuel pump issue
« Reply #14 on: June 28, 2018, 11:12:22 AM »
So I finally said oh well and brought it to a shop because I have no time to work on it anymore, they turned me down because it's not the "original motor" or original computer, So now I called another place that said they would work on it for me. Lol what a headache


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« Last Edit: June 29, 2018, 09:48:46 AM by bd »