tr7triumph.com

Might be a partial blockage somewhere in the fuel line.
Have you tried blowing though the fuel pipe with compressed air?
Disconnect rubber hoses at either end, and blow through from engine bay to tank.

Can't post any pictures in afraid it keeps saying file too big. If you are on the facebook page dursleyman its on there?

Haven't tried that Beans, but unless I can get it to work (30 miles) I haven't got excess to a compressor otherwise?

Polly-Red7 wrote: ... If you are on the facebook page dursleyman its on there?

The advantage of FB is that it is easy to post pictures. But that's the only advantage i.m.h.o.
No decent search function on there. Be of line for a few hours and you have missed loads of post, questions etc.
Probably why so much questions are asked over and over again on FB
And the main reason I hardly take the time to browse through them all. Let alone answer them

The pictures from today's cameras are huge. I have old cameras (1.3 Meg instead of 16 to 20 Meg of today) and can post those pictures. With a modern camera you have to down size the pictures in a graphics program of some type. FB automatically does and direct loads without a hosting site but like Beans says, here today, gone tomorrow type thing.

I've downloaded my photo back down from facebook so hopefully this will be resized to suit?

Although impossible to see from the photo the area 'below' the paper filter has fuel in it. Where you see sort of white mark there (below) indicates an air bubble. Where the filter element is in the upper part the fuel sits at best say 3 'vanes' from the bottom of the filter as photographed. Its obviously also sits in the bowl at an angle as the filter is at say a 20° Hope this makes sense? If you rev the car fuel is sucked through as I presume the float chambers require?

Try running without the filter-, insert an 8mm piece of pipe as temp. hook-up (or a longer piece of hose), worth a go - at least you`ll know one way or another

Air bubbles in the fuel filter aren't a problem as the carbs fuel bowls act as swirl pots and remove them.

Daft question - are your fuel lines kinked or pinched along their length? It's possible that a PO may have placed a jack underneath them in error creating a pinch point for crud to collect.

Well another fruitless day on the 7, still the problem taunts me!

Busheytrader I checked the fuel lines as suggested, nothing untoward was found.

I replaced the short piece of flexible hose that joins the two lengths of metal pipe as it was the only section not replaced with the tank roughly 2 years ago.

I've doubled checked the tank breather and tried two different fuel tank caps.

I removed the filter to see if that's restricting the flow and still no better. I can only presume now its the pump?

If I've missed anything please let me know before I go off to weep in the corner Chris

Polly-Red7 wrote: ... tried two different fuel tank caps ...

Make sure you have a vented fuel cap. Pretty easy to check, see last two pictures in this post in my weblog;
http://tr7beans.blogspot.nl/2010/06/dhc-report-nr-103-finishing-touches.html
Don't take it for granted when the word "vented" is on there

Hi Beans,
Both say vented on, but I will check (I followed the link you sent). How do you get them apart? Knowing my luck I'll break both!
Cheers Chris

Push down the retaining plate (by hand) and pull out the retaining pin with telephone pliers

Hi Beans,
Please forgive my lack of knowledge on this subject! I have attached a photo of my stripped (original filler cap).

I'm presuming it is of the vented variety looking again at your photos on the blog? Mine has little plastic caps either side housing a spring pushing down on to a rubber grommet. On one side inside the spring is a tiny ball bearing. Thanks for your assistance, Chris

Hello Hasbeen,

I was experiencing a niggling misfire which I just couldn't seem to cure.
I'd fix one thing and have the car running great only for the misfire to return the following morning.
I was getting tired and frustrated.
The advice contained in this thread was invaluable and I eventually fixed my TR7 by replacing plugs, HT leads and accuspark ignition in favour of the original burnt points.
What struck me the most was your priceless comment, "Just remember You're Having fun"
I thank you for this, I subscribed to it and it injected enthusiasm back into my work.
Sincerely
Max.

I had problems with my v8 losing power and eventually tracked it down to the so called vented cap not venting!!!!
Try and Run the car for a while then undo the cap if you get a whooshing noise you have a vacuum
Most tellingly mine was intermitten so sometimes it would run with no problems, other times it would die.
I fitted an aftermarket one and no problems.
I have rebuilt my cap with new seals and gaskets - there should be two valves in the cap
Worth trying an after market cap i think