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Well, here's the latest discovery.. As mentioned, the new electric feed-pumps made a terrible noise to the point where it sounded like the car was borken or something... With the negine idling, the old mechanical pump disconnected but running, it made a very pronounced "wuhu-wuhu-wuhu"...

I decided to go for an electric feed-pump, or rather, two feed-pomps in parallel to ensure that I got a feed rate that was higher than that of the High-pressure pump. The Local auto-warehouse had some units that wasn't too expensive. After installation and some priming to get the iar out of...

Hmmm, well, if the fuel enters low or high.. it still enters... Allso, read various articles where some people state that "the fuel gradually heats up" due to the continous recirculation through the engine bay, thus eventually causing boiling and vapour locks.. put my hand on the fuel tank...

Good point, conincident events may not allways be related! :) Well, I re-did the original vapour return line with 8mm ID tubing hooked it up to one of the fuel tank "vapour condenser" inlets, and hooked it up to the regulator bleed-off with a piece of flexible fuel line. At idle before driving...

Iagree, it sounds like vapor lock.. the only doubt I have about that, is that this didn't appear on the first drives I did after I modified to the return line system.. and the drive i had today was substantially shorter, i.e. it seems like something happened during the previous drive when this...

Guys, I have a frustrating problem with my fuel system.. and before I start ripping stuff apart and/ or throwing new parts at it, I would be gratefull for some advice... Here's the deal, I have a megasquirt EFI system fed from a high pressure pump, which is in turn fed from a the mechanical...

That sounds like the vent line from the tank to the charcoal cannister. Not all cars have these cannisters, so then you just have a dead end pipe in the engine compartment. I tried to use this line in my car as a fuel return line for EFI. Didn't work, the line was completely caked with rust...

Well, everything is relative.. and I did find that the ols cannister vent line to the engine compartment was for all purpose and intent blocked by internal corrosion. (no kidding!) So had my fioller cap not been vented, I would probably have sucked the petrol tank flat a good while ago...

Well, since I have a buddy with a really nice TIG welder, I'll porbably go for welding a pipe through the sender unit flange, allso saves me routing any pressurized line in to the boot. But If I didnæt have the option of welding stuff.. hmm.. no telling what I'd get up to! :) As my return...

Dart, Not quite sure I get you right, but to claridy, I don't have any Vacuum in my tank at this time, the open cannister return line allone will see to that. I allso think my filler cap is vented judging from the smell in that area on hot days! :) Its a long time ago, but when I replaced...

Dart, Good point about not knowing which line drains the separator! If I can't come up with any obvious way to tell, that pretty much excludes some of the options considered! It seems I have some sort of aftermarket cap, I'll need to check if it has any valve functionality or is just...

Bill, the link worked! :) If left with no other options, this would be a bolt-on solution! Having said that, the price is 61$ and 46$ to Norway.. then there is import tax and declaration fees... so modding my existing sending unit would be a more economic option. But thanks a lot for the...

67dart273, sweet! Thanks a bundle for that manual shot! That wasn't to be found in my chilton manual! At least schematically, that vapour/ liquid separator which it apparently is called, is definitively that tubular thing poking up in to the boot of my car! It's a '71 Swinger GT by the...

Ah.. after reading your thread on EFI fuel supply, I noticed that you had a TBI/carb redundance thought... Now this is a clever one I read about long time ago.. Use the intake manifold for a 4-bbl carb. fit it with injector bungs.. and use the carb as a throttle body! all you need to do...

"Too hot" is a luxury not seen to often in Norway, but on some summer days it can be! :) Anyway, thanks for your answer Bill, this was most enlightening! Apparently, it's been too long since I've been crawling under the old Dart now, forgot entirely about the sending unit back there, or at...

OK, bit of a strange heading there.. let me expand. I'm running a megasquirt EFI on my mild 318, works a treat. But after installing electric fans, average underhood temperature has incresed (fan not running all the time), and on hot days I get issues with fuel boiling in the rails as I only...

I've been running a Megasquirt I (with upgraded firmware) since about 7 years now, and Never had any problems with it. Any issues (not that there's been many) have allways been external, related to wires and sensors etc, i.e. things you could mess up with any system. Support and info on the...

Well, if you had joy with the narrow-band sensor, believe me, you'll love going wide-band! That controll box sitting in-line on the sensor cable is a must. Not exactly sure what it does down in details, but the wide band sensor is active and requires some feedback loop controll etc to make it...

Needsaresto, interresting link you posted there! Reading that article, this is obviously for a narrow band sensor. The issue with narrow band sensors is that they are only accurate around 14,7 AFR, or stociometric. Apart from telling you if you are lean or rich relative to stochiometric, you...

Dan, Se my recent post on AFR meter.. Runnig two AFR sensors would be both cost inefficient and unnecesary, assuming your engine and intake (fuel distributuin) is in reasonably good shape, the readings from one header or manifold side should be representative. Alternatively, you could of...

Reading through some of the posts here on carb tuning, I recognize a lot of issues I've had my self with regards to tuning carbs, be it for improved performance and response , or simply trying to sort out problems like bad idle, flat-spots, bogging etc.. For the amateur, like my self, the...

Just thought I'd share some recent experience here.. I'm running a Megasquirt EFI system on the 318 in my '71 Dart, whic I'm now in the process of re-tuning after improving the cooling with a new rad and electric fans and ugrade from narrow-band to wide-band Lambda sensor. After driving...