Please help, sorry it's a Turbo Marina!
Turbo Mini Forums

I think this is pretty Rad Makes me want to do something different. Datsun Cherry maybe?

Unfortunately I missed out on the shitty first car thing (other than my first mini) as I got the use of a company car for a few months after passing my test, a Sierra estate, before getting a brand spanker Escort van in November 1993. Had a new car every three years after that

http://www.youtube.com/watch?v=8GLJgnp51Zg

Here is a video of my setup, swapped the pipes round and now it doesn't flood at all!!! Still doesn't explain the results in the video!

Looks like the regulator isn't bringing the pressure down. Have you got another one you can try?

All you guys with your flash first cars, i dreamed of an ital or a cortina. My driving career started with a lowly fiat panda!

can only suggest trying a new regulator

Done now needs redoing lol

I would if it wasn't for the fact that I am using a brand new one and I tried the old one and same result! I'm clearly going mad! Swapped fuel lines round and now seems ok. Inline fuel pressure gauge ordered. Also going to mount one in the dash once all set up. So hard to find a good quality electric gauge and sender on fleabay. Glowshift or VDO?

Now oil probably thinned down so will change!

Waterless coolant! Amazing stuff?

so youve swap the fuel lines around and got the pressure at a normal psi

Done now needs redoing lol

I think I have. Bought a draper pressure gauge today. Will test it when I get home although it seems ok! Then I will get my tools than sadly no modern day mechanics understand. Colortune, strobe light, dwell meter and feeler gauge, rule of nine and should be running nicely. Thank you so much for the input. I will reveal the pressure soon.

OK, old regulator in place, thick line returning petrol to tank, thin line feeding fuel regulator, after mucking around with the screw on the top, I obviously need to calibrate the regulator, so I test the fuel to the carb, 10 psi, the carb float valve obviously doing good job to hold back!!!

I adjust screw turning it in, the fuel pump is starting to strain, the pressure is dropping 9, 8, 7,6 and then the pump stops and the regulator is whistling like a kettle in a film, and so cut a long story short, 7 psi is the lowest I can get it.

Option a) try the new regulator, obviously doing this tomorrow morning.

Option b) Do I, or did British Leyland have a small t piece or small bypass tube from feed to return to allow a bit less pressure, I don't want to do this but think, if nothing else, I could at least get the pressure correct as I now have an accurate gauge.

Option c) Should there be a ballast resistor connected to the pump?

Or am I just completely missing something??? I don't believe I have any restriction in the return pipe to the tank, but what diameter should I have, I have 8.7mm outer diameter all the way.

Many many thanks in advance.

I have experienced this recently on a friends car and it turned out that he was sold the wrong Malpassi regulator which was set for 7psi and if you tried to set it lower would get to about 5psi before causing a pulsing of the pressure from zero to 6psi.

Make sure the regulators you have are the right ones. Not being a carb user, you'll have to rely on others to help you there which one os the right one since they pretty much all look the same.

I ended up putting a small pipe from the feed (from tank) to the return (to tank) and this allows some fuel to bypass the regualtor and return to the tank, all a bit stupid, both the brand new and old regulator can regulate down to 7 psi and then they start pulsating!!!!!

Does anyone else make a regulator with boost sense?

I may buy another regulator anyway or modify the old one.

Any ideas?

normally you unscrew the reg adjuster to lower pressure ..hoses on the right connections?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Well, it's all about the spring inside the regulator - so this is easy to modify at least by shortening it to lower the pressure.

Other thing to consider - is the pump itself... Was this the pump from the K-jet xr3i with the mechanical Fuel injection?
IIRC, these pumps are like 20% higher system pressure than the more conventional EFI systems. I seem to recall I tried one of these myself like 15 years ago - and ended up swapping it out for one off a vauxhall or something else almost immediately - but I don't honestly recall why; maybe because of some fuelling issue.

As you have two regualators, both with this same issue, perhaps you need to look at the pump. I bet someone on here would sell you a metro turbo pump for a few quid - or you can just steal one off any scrapyard car with a basic efi system.

Edited by turbodave16v on 9th Jul, 2013.

Ran pipe from tank to pipe to tank with t-piece and pressure gauge, guess what! 15psi!!!! way too much resistance, unscrewed fuel return line at tank and put into a jerry can and 2psi, so problem is simply the connection on the tank for the return!

I will keep you updated.

But earlier you said you had the return pipe going straight into a petrol can snd still had high pressure.....

I did, but coming off the fuel pressure regulator going to the petrol can was a piece of 7mm pipe stretched over the tail.

My conclusion is as follows:

a) Fuel has to go somewhere!

b) Getting fuel to the engine is never really going to be a problem even with 6mm internal diameter pipe.

c) No such thing as a 30psi pump, pumps don't create pressure, they only stop pumping when the strength doesn't exceed the resistance put upon them by a blockage of some description.

d) Measure your resistance in your return by putting feed straight into return with pressure gauge t'd in the middle, your fuel pressure regulator will NEVER be able to provide your carburettor with a lesser pressure than the pressure created by the return to tank pipe.

e) Make the return pipe pressure less than 3psi to ensure correct operation of the regulator

f) Low pressure on the return in my case was achieved by using 10mm id fuel hose, one restriction of 8mm and you might just as well have 8mm all the way.

This is what I discovered for myself, I don't believe ANY if this information is anywhere else on the forum, please correct me if I'm wrong but I now have a perfect running setup although not driven it yet so turbo side untested.

Many many thanks for all input.

Well congrats on figuring this out all on your own.

I don't know how you arrive at the conclusion that the information was not already in the forum or existing knowledge of members on here or obvious based on the advice you received. If we tell you to run a large bore return than your feed, common sense says that this is all the way surely???

I wasn't meaning it like that, I simply mean I have found a few things out by lots of trial and even more error and just learning about fluid dynamics. The fact someone, I think it was you, mentioned the bigger pipe for the return and this was definately putting me in the right direction so thanks to this forum and the people on it, I solved the problem.

Thanks again. Now adjustable easily and stable between 3 and 25 psi.