BioFuels Technologies Forum

BioFuels Technologies Forum (http://www.biofuelstechnologies.com/forums/index.php)
-   94-97 7.3 (http://www.biofuelstechnologies.com/forums/forumdisplay.php?f=3)
-   -   vegi-beater......a build story (http://www.biofuelstechnologies.com/forums/showthread.php?t=3901)

Vandy 08-28-2012 06:12 PM

vegi-beater......a build story
 
I figure instead of having several (i have no clue what I'm doing threads) ill just start a build thread with all my random questions included... lets get right to it

im building my Mach up efuel system right now and ive run into a question that i cant seem to find any clear answers on.

ok here we go. my plan right now is mounting my prefilter/pump/filter on my frame rail. deleting my fuel bowl, running the lines in the back ports on the heads. now here is my question. and keep in mind this diesel world is like learning japanes.

so the 7.3 has ports in the front and the back of the heads. i havnt gotten into it on my truck yet, but are all 4 ports used in a normal system? meaning pressure goes in the back and front is a return for whats not used? doesnt sound right to me?

what im thinking is fuel is run from the filter/pump/filter to a FPR, your set pressure lets say 75psi is run to the back of the head, the what excess pressure is there comes from the FPR back to the return lines to the tank?

that said, i see most FPRs are mounted on top of the HPOP. if i were to mount mine back on the filter/pump/filter plate and run the return to the tank? any pros/cons to this?

I guess the alternative is running a 6L pump that's internally regulated.

also for what ever its worth most e fuel set ups posted are with out veg. So i know mine will be different from most I've seen so far.

any input yall have is appreciated

thanks
Vandy

skyskijason 08-29-2012 12:22 AM

It does not matter which end of each head ya send the fuel(s) to. The later-model 7.3's send D2 to the drivers-front and pass-rear, but there is no good reason to do it this way if yer starting from scratch.

Your FPR would be best plumbed right after the fuel pump (I recommend OE-type 7.3 pump - $39.95) and before the D2 primary filter.

Also, ya don't have to put D2 CV's on the heads the way V3 is normally set up. We do this since it is the least invasive way to modify the OE fuel system. I recommend putting a 3/8" CV just before the tee to the heads. The larger CV is more durable and will be easier to change here - should you ever have to.

I also recommend using PTFE-lined SS braided hoses w/swivel JIC ends in the engine compartment. Somebody posted a link to a JIC check valve once that would be ideal to put just before the tee to heads - but terminating one end of the D2 lines in NPT and using an NPT tee and CV would be OK too! Here's a link to some DIY SS hoses, but you can likely get them made up at a hose shop for about the same $$ (or less!!).
http://www.discounthydraulichose.com...p/r14-hose.htm
http://www.discounthydraulichose.com...ings_s/182.htm

WARNING!!!!! If you use this hose, you must protect everything from the hose - it WILL wear a hole through anything it touches. I think the tubing AZDave has put over his SS hoses is vinyl/PVC?? I just put cheap rubber fuel hose on mine...

Another recommendation is to add a valve at the tee to the heads from the V3. Closing this valve will allow you to drive on D2 in the event you run over a prius and rip the V3 out from under the truck! :tease: (or the more likely event ya have a CV or purge valve issue on the V3... :)). Putting valves on the coolant lines is a good idea as well.

skyskijason 08-29-2012 12:35 AM

After re-reading your post...

There will be no 'return from the heads' anymore. You will send 55-75psi to the heads and the injectors will consume it. All 'excess' fuel will be returned before it gets there. The V3 'returns' fuel to the suction-side of the pump inside the manifold and your FPR for the D2 side will now be before the heads. (like I said above, putting it near the pump is a good idea)

No need for D2 pressure to be over about 55psi, but crank the V3 pressure up to 75psi (the limit of the fuel filter). :woot2:

I didn't think the 6.0 pump was internally regulated - but I really dunno much about those engines. Actually, I dunno much - besides the fact that BEER IS GOOD!!! :hey:

Here's the cheap made-in-USA 7.3 pump (lifetime warranty too!!):
http://www.ebay.com/itm/ws/eBayISAPI...m=380460801546

Vandy 08-29-2012 01:08 PM

[
Quote:

Originally Posted by skyskijason (Post 48087)
After re-reading your post...

There will be no 'return from the heads' anymore. You will send 55-75psi to the heads and the injectors will consume it. All 'excess' fuel will be returned before it gets there. The V3 'returns' fuel to the suction-side of the pump inside the manifold and your FPR for the D2 side will now be before the heads. (like I said above, putting it near the pump is a good idea)



Here's the cheap made-in-USA 7.3 pump (lifetime warranty too!!):
http://www.ebay.com/itm/ws/eBayISAPI...m=380460801546

have you used oneo of these pumps. i saw a link to it a while back and was checking it out. the reviews from the company are pretty low. i just wonder if its worth trying. i was thinkin about getting 2 of them. that way if one takes a dump ive gor another i can swap out and keep going until my replacement gets here.

so FPR close to the pump. i asked this question in another forum and got a different answer but the guy didnt seem to know anything about running wvo so i wasnt going to put too much stock in what he had to say.

thanks sir.
any recomendations and a FPR? ive been looking at a few that will hit my pressure but havnt seen any that says they are for diesel or not.:bang:

skyskijason 08-29-2012 02:06 PM

Quote:

Originally Posted by Vandy (Post 48104)
[


have you used oneo of these pumps. i saw a link to it a while back and was checking it out. the reviews from the company are pretty low. i just wonder if its worth trying. i was thinkin about getting 2 of them. that way if one takes a dump ive gor another i can swap out and keep going until my replacement gets here.

so FPR close to the pump. i asked this question in another forum and got a different answer but the guy didnt seem to know anything about running wvo so i wasnt going to put too much stock in what he had to say.

thanks sir.
any recomendations and a FPR? ive been looking at a few that will hit my pressure but havnt seen any that says they are for diesel or not.:bang:

I haven't used one yet... You can get one with a 1yr warranty from local autoparts for about $150. I'd be tempted to get (2) cheap ones and roll the dice!! I burn VO about 75% of the time, so it'd take 100k miles to see 25k miles on that pump in D2 service. Its not gonna have a very hard life! Don't they have a 'lifetime warranty' on the cheap ones? You can run pump #2 until they get ya another one. It'll take 5min to swap pumps, but even that'll get old if they don't hold up...

I have a magnafuel FPR on my diy VO system. It has like 120k miles on it in WVO service - I think it'll do FINE on D2!!
http://www.jegs.com/i/Magnafuel/665/...rentProductId=

Fanderson 08-29-2012 07:49 PM

Here's a link to the post with the pics of the single check valve in the engine valley of my '97. I got it at a hydraulic fittings store. I forget the brand name, but it's holding up well.

http://www.biofuelstechnologies.com/...0&postcount=13

Fenker 09-01-2012 02:26 AM

Dfa used to have an obs kit and I have one and it came with a msd diesel pump and an inline fpr. They originally used the stock fuel bowl, BUT the obs fuel bowl cant hold the pressure. I deleted the bowl and put my filters and pump on the frame and right after the pump I have a T that goes to my inline fpr back to te tank. Unfortunately the fpr has absolutely no markings on it so idk who makes it or where to get it.

Vandy 09-01-2012 10:36 PM

I'm glad I've found this out. It will change,and actually make its a little easier than mounting it under the hood. I'm working on my brackets now. Thinking i might grab 2 of the 40 dollar pumps to give them a try. Ill get pics as soon as i have anything worth showing

Fenker 09-01-2012 11:53 PM

If ur getting a good fpr, the ones with the gauge on them, u might want to find a way to protect that thing, I think that is the main reason people put them on there hpop.

Vandy 09-02-2012 05:18 PM

Yeah ive thought about that. Might make a "shield " to go over it with some cam locks or something for easy access


All times are GMT. The time now is 03:57 PM.

Powered by vBulletin® Version 3.7.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.