87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #15 – October 23, 2005, 03:24:48 PM think it is fixed now time will tell for sure Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #16 – October 24, 2005, 11:10:50 AM Cool, keep us updated. *crosses fingers* Quoteaccording to the 88 owners manual, it says 22.1 gallons, it also says that its recomended to change the fuel filter every oil changeIt "said" that?! You have a talking owner's manual? That's gotta be a rare option bro, hang onto that big time! What else does it "say"? :flip: Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #17 – October 24, 2005, 11:30:39 AM Quote from: EricCoolCatsIt "said" that?! You have a talking owner's manual? That's gotta be a rare option bro, hang onto that big time! What else does it "say"? :flip:It makes up for the talking 83's...Ford could never keep their mouths shut. Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #18 – October 31, 2005, 11:56:22 PM Quote from: SLEEPER T-BIRD 87it has the stock tank,modifyd pickup with dual 1/2 pickups 1/8 off bottom of tank1/2 fuel line to holley blue pump 1/2 line to regulator 1/2 to n20 selonoid and 3/8 to carb.this is all an issue with my 429- c/6 converted t/c.Here is what I seriously think the problem is: Your fuel vent line opening is too small for the fuel demands of the 429. Leave the gas cap off, and drive it around like that for a short time, and see if the problem persists. I had a customer build a serious 408 mustang using the stock tank, with a giant fuel pump, line, etc...and he partially collapsed the tank due to vacuum.... Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #19 – November 01, 2005, 12:15:25 AM Quote from: ButtSlappingPirateHere is what I seriously think the problem is: Your fuel vent line opening is too small for the fuel demands of the 429. Leave the gas cap off, and drive it around like that for a short time, and see if the problem persists. I had a customer build a serious 408 mustang using the stock tank, with a giant fuel pump, line, etc...and he partially collapsed the tank due to vacuum....you got it. have to take the gas cap off. I will be adding a 3/8 vent here in the next few weeks.for now car is fixed just not drivable cause i have the motor torn down. Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #20 – November 01, 2005, 02:33:27 PM Quote from: SLEEPER T-BIRD 87you got it. have to take the gas cap off. I will be adding a 3/8 vent here in the next few weeks.for now car is fixed just not drivable cause i have the motor torn down.Go with a 1/2", if you can.....that's my suggestion.Since I have appeared to fix your problem ( we shall see, lol), I want to see gratuitous images of your 429 car, got it? Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #21 – November 01, 2005, 03:23:03 PM Quote from: ButtSlappingPirateGo with a 1/2", if you can.....that's my suggestion.Since I have appeared to fix your problem ( we shall see, lol), I want to see gratuitous images of your 429 car, got it?found it a few weeks ago when i switched to another larger fuel pump. pics are over in user rides under my name:D Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #22 – November 01, 2005, 05:24:35 PM Quote from: ButtSlappingPirateHere is what I seriously think the problem is: Your fuel vent line opening is too small for the fuel demands of the 429. Leave the gas cap off, and drive it around like that for a short time, and see if the problem persists. I had a customer build a serious 408 mustang using the stock tank, with a giant fuel pump, line, etc...and he partially collapsed the tank due to vacuum....In SLEEPER T-BIRD 87's case, his 140 GPH pump equates to 18.7 ft^3/hr (.312 ft^2/min). The vent tube is more than adequate to move that amount of air. Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #23 – November 01, 2005, 06:34:30 PM Quote from: JeremyBIn SLEEPER T-BIRD 87's case, his 140 GPH pump equates to 18.7 ft^3/hr (.312 ft^2/min). The vent tube is more than adequate to move that amount of air.The stock unit? Or the 3/8th's vent line as proposed? Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #24 – November 01, 2005, 07:21:32 PM The stock unit. If my math is right, you only need a teeny-tiny vent line even with a very powerful engine (lots of fuel being used per unit time).I ran for two years (ignorance was bliss) with my vent line capped. The only result was a large sucking sound every time I opened the gas cap to fill up. Running your tank in a vacuum won't affect anything until your fuel pump can no longer overcome the increased pressure ratio required because of the vacuum. Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #25 – November 01, 2005, 07:31:33 PM Not to give math the appearance of not applying in "real-world" situations, but the vehicle I gave for an example was using a stock 3.8 mustang tank, and collapsed it due to the vent line not being large enough for the fuel demands of a 408. In addition, I have ran across other vehicles that have had vent line issues, guys beefing everything else up, but ignoring simple "math", where fluid going out of a sealed box must be displaced by something else, such as air, or another fluid....guys running into unexplainable stumbling problems in the top end or even mid track. Go ahead and run the stock line, if you feel the "math" lets you do so. I am simply stating that running an engine that has three times the fuel demands of the original engine might need some vent line mods...and am bringing up personal history on the topic... Quote Selected
87-88 t/c v.s 87-88 5.0-3.8 fuel tanks Reply #26 – November 01, 2005, 07:46:54 PM Yeah, math or not...I'll defer to experience. Quote Selected
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