TANGO7 Posted July 29, 2020 Share Posted July 29, 2020 Maybe I'm becoming too sensitive, but I've noticed a distinct smell of petrol whilst driving my Crossflow (1600 Twin 40s). Although, to a certain extent,TADTS, this seems stronger than I've noticed in the past with other Crossflows I've owned. On switching off the engine there is sometimes petrol seen in the body of the carbs when viewed through the aperture of the (removed) inspection plate to the rear of the carbs. Any thoughts or just time to replace all seals in the carbs? Link to comment Share on other sites More sharing options...
SM25T Posted July 29, 2020 Share Posted July 29, 2020 Check all flexible fuel hoses too. They harden and perish all too quickly. Link to comment Share on other sites More sharing options...
TANGO7 Posted July 29, 2020 Author Share Posted July 29, 2020 SM25T. Thanks - No visible leaks/perishing of hoses. Link to comment Share on other sites More sharing options...
Roger King Posted July 30, 2020 Share Posted July 30, 2020 First place to start is checking your float levels, the state of the needle valves and your fuel pressure. Link to comment Share on other sites More sharing options...
TANGO7 Posted July 30, 2020 Author Share Posted July 30, 2020 Roger K - Thanks. Is it possible to give a precise ideal value (or range) for the fuel pressure. I am right in thinking if there is excess unburned petrol (causing the smell and residual petrol after switching off) then the pressure is likely to be too high??? Link to comment Share on other sites More sharing options...
barry watts Posted July 30, 2020 Share Posted July 30, 2020 I was getting a strong smell of petrol after fast cornering. The front carb float level turned out to be a bit on the high side.Baz. Link to comment Share on other sites More sharing options...
TANGO7 Posted July 30, 2020 Author Share Posted July 30, 2020 Baz - Thanks. Smell is not related to cornering as occurs when driving straight and also at rest. However, perhaps float levels are an issue, which would concur with Post #4 Link to comment Share on other sites More sharing options...
opplock Posted July 30, 2020 Share Posted July 30, 2020 I'd get it checked out post haste. My x/f had a Viking funeral shortly after I noticed a strong smell of petrol. Deciding that I'd check it out when I got home (8 miles away) wasn't the best idea in hindsight. Link to comment Share on other sites More sharing options...
Englishmaninwales Posted July 31, 2020 Share Posted July 31, 2020 Float chamber levels and condition of hoses as described above. If fitted, check the cold start mechanism on both carbs, they are a good source of petrol leaks.Malcolm Link to comment Share on other sites More sharing options...
Roger King Posted August 1, 2020 Share Posted August 1, 2020 Fuel pressure should be around 2psi which doesn't sound a lot, but all it needs to do is dribble fuel in at the rate it is being consumed.Excess pressure is a more likely problem if you have an electric pump. If you have a mechanical pump, check that the diaphragm isn't split as this can cause fuel to leak into the oil: an inexplicably high oil level is sometimes also a clue that this might be happening. Link to comment Share on other sites More sharing options...
OldAndrewE Posted August 1, 2020 Share Posted August 1, 2020 If I have an electric pump with a stated pressure (on a closed outlet) of 4.26 +/- 0.4 psi feeding twin 40 Dellortos on a XFlow will that be OK or do I need to fit a regulator to reduce it? Link to comment Share on other sites More sharing options...
Roger King Posted August 1, 2020 Share Posted August 1, 2020 That's not a huge pressure, but it would be better down between 2psi and 3psi. The first thing is to get the pressure checked so that you know for certain what you have, and ideally fit a regulator if it's too high. However you are not into the ridiculously high zone if the stated pressure is correct, so it may not be causing any issues. Link to comment Share on other sites More sharing options...
OldAndrewE Posted August 1, 2020 Share Posted August 1, 2020 Thanks Roger, when the car is back together I will do that Link to comment Share on other sites More sharing options...
barry watts Posted August 2, 2020 Share Posted August 2, 2020 Just been reading on piston heads an article about the Minder capri going up in flames. The comments are suggesting that the current specification of petrol is melting the fuel hoses. Any advice on this, regarding what should be used would be gratefully received. P's any youngsters will have to Google Minder/Dennis Waterman. Baz. Link to comment Share on other sites More sharing options...
SM25T Posted August 3, 2020 Share Posted August 3, 2020 SAE J30 R9 .... in 8mm bore on K-series Link to comment Share on other sites More sharing options...
SM25T Posted August 3, 2020 Share Posted August 3, 2020 This is where I buy mine .... see also the hose clips further down the page https://www.advancedfluidsolutions.co.uk/76mm-id-516-saej30r9-nitrile-rubber-fuel-injection-hose-sae-r9-628-p.asp Link to comment Share on other sites More sharing options...
elie boone Posted August 3, 2020 Share Posted August 3, 2020 Often it's the needle valve of the carburetor closest to the fuel pump that let go first. Link to comment Share on other sites More sharing options...
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