Fuel Pressure Issue

[CERES2]

I'm going deep now because this issue has been haunting me for too long. Ordered a used fuel tank from SOR (mine is a bit rusty) and a new fuel pump, filters and gaskets from American Toyota. It will be a week or so before I will have this done. Perhaps the dirty tank wore out the fuel pump early (or is 184k normal?).

If this still does not do the trick, I will start looking at the MAF perhaps.

Please post some pictures of the wire upgrade and EFI relay relocation. I would like to see from where to where exactly the wiring should be replaced.

 

[SUMMIT CRUISERS]

This afternoon I went and met my wife to drive the truck back. Got about an hour into the drive and I would call it a loss of power or lurching feeling when under hard acceleration. I stopped and checked the fuel cap for excessive pressure buildup and noticed nothing out of the ordinary. EFI was then checked and was hot but not excessively hot. I then pulled the negative battery cable off for about 5 minutes, hoping to reset the ECU. Started driving again and about 15 minutes later it started lurching again. I found a receipt where I purchased a Bosch fuel pump for it about 4 years back with a lifetime warranty. Tonight I will be changing that out with a new filter sock and see what goes tomorrow. If its not the pump, the fpr, filters, efi relay, efi wires, I'm leaning towards the igniter/coil? Any ideas?
Ceres2, I'll get some picks of the EFI relay relocate for you tomorrow.

 

[SUMMIT CRUISERS]

92 Update:

Changed the fuel pump and prefilter. Prefilter (sock) looked sucked in and could be the problem. (See pic) Drove truck around town for an hour. Let it idle for another 2 hours then drove it like I stole it and it performed very well. I'm hoping that was the culpret. Next weekend I will drive it about 2 hours out of town and see how it does.

CERES2, Pics of the EFI wiring upgrade were not taken while "under the knife". I did use (2) 5 'pieces of 10 gauge wire, (2) 5' pieces of 14 gauge wire, (2) 10-12 gauge butt splices, (2) 14-16 gauge butt splices. There are 5 wires that go to the EFI relay. 2 are together the other 3 are separate. I spliced in a 10 gauge coming from the fuse and another 10 gauge coming from a grey connector about 12" from the relay. The other 2 were very small wires probably 18 gauge that I tapped into with the 14 gauge wire. Butt splices were filled with silicon, crimped, heat-shrinked and taped. The connections on the relay are insulated and heat-shrinked as well. Didn't see any existing issues except the grey connector I tapped into seemed heat distressed. May need to bypass that connector all together. See pics.

 

[CERES2]

Update: Got around to replacing the fuel tank and the fuel pump (plus sock filter). Take a look at the gunk in the old tank. Still not sure if this solves the problem. I will take it into the desert next weekend and report back. Had to take the rear driveshaft off to get the old tank out.

 

[Ebag333]

Looks nasty. Mine was not anywhere near that bad.

 

[SUMMIT CRUISERS]

CERES2, I think once you have a clean tank, new fuel pump, strainer and filter it will work perform just fine. Tested mine this weekend after the new strainer and fuel pump. 450 miles averaged 73 mph, 13.25 mpg and no problems whatsoever. Problem solved. Original strainer was definitely cavatated "sucked in" and fuel pump probably just couldn't perform at full capacity once it had been running an hour. Hope yours turns out like mine. Best of luck to you.

 

[CERES2]

Victory!! Took the cruiser up to Chimney Rock East of Tucson. 50 or so off road miles without any recurrence of the hesitating/lurching problem. What a great run on a great day. It was definitely a bum fuel pump which must have been caused by all the rust in the tank (or old age). Truck has way more power than before and idles much more even. Thanks Summit for your posts.

Only wish I had started there. Oh well, guess it never hurts to get some nice new parts installed.

 

[jonheld]

Update: Got around to replacing the fuel tank and the fuel pump (plus sock filter). Take a look at the gunk in the old tank. Still not sure if this solves the problem. I will take it into the desert next weekend and report back. Had to take the rear driveshaft off to get the old tank out.

I'm confused. In your post #4 you said you cleaned out the fuel tank and replaced the pump pre-filter. That was Aprill 11th. You're telling me that all that crap accumulated in your tank in a month? C'mon now...

 

[CERES2]

All I can say is that draining the tank through the drain plug was clearly not the way take care of this problem. I now believe that any amount of rust in the tank will eventually cause problems.