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Thread: 400FWHP TBI build attempt thread

  1. #16
    Fuel Injected!
    Join Date
    Mar 2015
    Posts
    45
    My apologies for lack of updates. It's been a slow month. Trying to get a few things sorted out in prep for the go fast portion of the project. All I've managed to do is install the FPR and salad bowl. I debated on where to mount the regulator and settled on the inboard stud for the master cylinder on the brake booster. I just bent the 13301's bracket to a 90* angle. I'll add a pic a little later. Rebuilt transmission is a blast with 2500 stall and 3.73s. Picked up a decent Derale cooler to take care of it as well. I did bite the bullet on the Holley TBI intake, know what I'm up against to make it work. Running the earlier EGR on it, and Professional Products makes an adapter that rotates it out of the way of the IAC connector. Pics of some of that later on as well.

  2. #17
    Fuel Injected!
    Join Date
    Mar 2015
    Posts
    45
    One more update, nothing exciting. I replaced the fuel pump with the EP381. Did the tank from the bottom after pretty much running it out of gas since it didn't have much in it when I got it, havn't put any in it since June 2016. I found the filler neck ground strap hanging loose (yikes). The fuel sender ground wire outside the tank was 2 pieces of wire with a wire nut and a lot of electrical tape around that (more yikes). Fuel line fittings at the tank are 19mm/16mm. I replaced the o-rings on the couplers on the tank side. BWD makes a pair for$3.99, BWD part # 27478, same as the Fuel line to TBI fittings o-rings, available at most parts stores. Observations/ conclusions- The pump has been obviously replaced before, found an Airtex E3902 inside the tank (stock replacement). The EP381 kit's rubber foot isn't qute a direct fit on the bottom support for the pump but holds fine when the strainer is on. I used a 50 micron strainer, Spectra A02STR. I capped everything on the tank once it was out and did a proper splice on the sending unit ground wire, with heat shrink sleeve and a proper connector on the end. The rear tank strap can be a real pain to get back in. The front one I just pulled the nuts for its bracket off the frame rail. I did all this on grass, lying on a sheet of cardboard, lol. To slide the tank out from under I just jacked the truck up by the diff and slid the tank out from the driver' side and used the same method to slide it back under, then lowered it again. I know a lot a folks are fans of doing the bed lift on the driver's side but I see no need for the trouble on a 2WD truck without all the extra shields a 4WD has.

    I had issues with the dry 0-100psi gauge on the regulator. Wouldn't register anything, even with the 0-20psi spring in the regulator maxed out. I contacted the vendor and am awaiting a response. I bought the gauge in Late December. Their warranty is 30 days on everything, which I'd expect for their nitrous parts, but I'm hoping they'll pony up and do the right thing for a DOA gauge on first install. They have a great reputation on ls1tech so I'm cofident they'll be willing to help. Meantime I just grabbed a 0-15psi Mr. Gasket carb gauge and set it at 12psi running. Everything is good for fuel system to support the heads and cam swap, just need to be able to set pressure with the 20-60psi spring when the time comes. At worst I'll bite the bullet and get an Aeromotive wet gauge with the pressure relief button on it if I can't get help on the (dead) dry one.

    I'm thinking about doing the exhaust and wideband next. The most it will cost me is a cheap pair of header gaskets to throw away when I do the top end work.
    Last edited by Gojira94; 02-22-2017 at 09:12 AM. Reason: added part #s

  3. #18
    Fuel Injected!
    Join Date
    Mar 2015
    Posts
    45
    My world kind of blew up 3 days after the last update, not much of anything done for a while. Just wanted to say I haven't given up and I will be back with more updates in the next couple of months. Thanks to all who have had feedback and been helpful answering questions so far.

    Thanks,

    Rob

  4. #19
    Fuel Injected!
    Join Date
    Mar 2015
    Posts
    45
    I did follow the advice of Dave W and Fast355 and bite the bullet and seek out a good pair of completely reconditioned, flow matched 80#/hr. injectors (5235231). The more I read about taking the 5235206 61#/hr. above 28-30psi the more I became convinced I needed to go bigger. So I'll be around 22-23psi on the 13301 regulator at WOT, much more comfortable with that. The only things I'm lacking at this point are time, a place to do the work and pushrods, lol. Though I do have a length checker for when the time comes.

    Funny thing, I ran across a 94 LT1 F-body cam from a project back in 2009. Looks like it got some moisture exposure and has light rust in a couple places. I'll clean it up and post a pic, maybe someone can use it.

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