Topic: Message #1153357

[SlayTank]

Update from the other side of the states! What was happening to me was it would fire up great in the morning but after a couple stop and shut downs, Id come back out of the store and Id have to crank it forever all while it was puking black smoke. (side note) I hadn't driven it for awhile as I am now 42 miles from work and have a 1987 CRX HF that gets 49.5 mpg (trying to break the 50MPG!) I drove the truck out into the desert wastelands to go shooting about a month ago and tossed the rifles on to the hood. As i was loading and switching rifles throughout the afternoon I started hearing bubbles and boiling... the sound was coming right out of my little dryer vent scoop. This was the smoking gun I had suspected. (really i should have known better) After driving and the thermostat housing heating up and my fuel line (pump output to reg) touching the housing  it was boiling the fuel, pressurizing the regulator and flooding the carb. I tried to space off the fuel line with a loop clamp using the thermostat hosing bolt to no success, same issue. I had also previously gotten a new redline regulator with the marshall gauge that H8PVMNT recommended (works great by the way, but not great enough to overcome the angry boiling gasoline). I looked at possible solutions and decided that a hardline run back over the fuel pump should work well. I measured the output barb diameter and it was a perfect 1/4' hardline. I decided to go with hardline A/N fitting tube adapters to regulator and braided line from reg to carb.

I went with stainless steel hardline because it doesn't like to transfer heat therefore keeping the gasoline colder although aluminum may have been cheaper, easier to work with and done just as well. So I dove into the A/N fitting world and boy it is immense. Ill post up my parts list if anyone cares. Turns out that the only male AND female a/n 1/4 hardline adapters come from aeroflow in Australia and are of the -4an size. The conventional way to hardline adapt is a -6an male with a tube nut but in that case you need to flare the tube (37-1/2 degrees i think) and I did not have a flare tool. I got most of my parts from Jegs and then some from areoflow so shipping was around 2 weeks coming from the former prison island (Australia).

The tube adapters use compression fittings (which i had never worked with). Of other note the 3/4 NPT 90 degree adapters to -6an I had bought were of the swivel type because I was afraid that when tightened down they would be facing the wrong way(maybe this wasn't necessary and could have been done with conventional 90 degree adapters) So got all the parts in and started bending tube with my 180degree tube bender. i mapped out the route with some 1/8inch wire I had laying around but that did not work out well as the radius on 1/4 tube was a lot different then my guess with the wire. I came away with a new respect for hard tube routing/bending. It came out ok but not as nice as I would have liked. If I did it again I would have done the wire routing ALONG with cutting a small piece of tube, bending to 90degrees and use that as a template for bend radius. Also of note I bent and cut the tube without the -4a/n adapters from aeroflow because I didnt want to wait any longer to start. Turns out that the hardline adapters are a bit longer then I had expected so I had to rework the tube a little which stainless is not to fond of. I cut the hardline from the pump a little to short as well(had to cut the little bulge off). I used my tube cutter from my brake line kit and that spaced me about a 1/4" back from the bulge, which I thought would be fine but like I said the adapters are longer then I thought so the end of the adapter is pretty close to the bend in the pump output. If I did it again I would have used a hacksaw or angle grinder to cut it RIGHT next to the bulge to lengthen it out a bit. Anyway I'm done talking ask if you got any questions...

P.S. I havent tested yet because... you start doing one thing and that leads to another, now I have the bumper off. If you give a mouse a cookie I guess. I did start it and checked for leaks. If it continues to boil I will slide some thermal heat shielding tube stuff over it from Jegs.

Parts
Reg http://www.jameng.com/products/Redline-Fuel-pressure-regulator.html
Hose Fittings http://www.jegs.com/i/Earls/361/AT800106/10002/-1
Hose http://www.jegs.com/i/Earls/361/303006/10002/-1
Reg to hose adapter http://www.jegs.com/i/Earls/361/AT922166/10002/-1
Hardline http://www.jegs.com/i/Earls/361/641636/10002/-1
Hardline to reg adapter http://www.jegs.com/i/Earls/361/AT165064/10002/-1
Other piece hardline to reg adapter http://www.jegs.com/i/Earls/361/AT923166/10002/-1
A/N to carb (Needed cut/file down length of threads to seal on carb) https://www.aeroflowperformance.com/fittings/adapters/metric-to-male-flare-adapters/af729-06blk
1/4" hardline female adapter https://www.aeroflowperformance.com/hardline/tube-adapters/af109-04blk
1/4" hardline male adapter https://www.aeroflowperformance.com/hardline/tube-adapters/af108-04blk