Trick 1 Posted October 3, 2006 Ive read the article re: mi16 conversion with carbs, and done a few searches on here, but i need some additional advice from others if poss. Just had an mi16 conversion with twin weber 45s, and when the car went to the RR for a setup, they stated that the current fuel pump would not provide sufficient fuel when the engine was running at greater loads. I already have a facet fuel pump (which one i do not know - it isnt yellow or red top), and thought that this would be ok...and I have spoken to a few others and some say they use the original pump, some have added a yellow or red top. So not sure why they would say i need a better pump. Maybe the current pump is not as good as it should be (second hand) and it clicks very loudly whilst driving along, sometimes stops making the noise and others it just clicks away. Not sure if this is normal or not. Anyone have any advice on this matter please? Share this post Link to post Share on other sites
boombang 2 Posted October 3, 2006 Sounds like you have one of those little solid state pumps - whilst on a 1600 you'd be fine, an Mi may well need more fuel than that can provide. Carbs do have an interal reservoir so if you use more than the pump provides it will empty and the engine will stop. Best off IMHO getting one of the low pressure, high flow Holley pumps rather than Facet - makes a lot more sense! Share this post Link to post Share on other sites
boldy205 75 Posted October 4, 2006 i think the clicking your hearing is the pumps filling the float chambers in the carbs, therefore if its clickng a lot then the pump is struggling to keep the carbs fed. so yes maybe a pump that flows more is the answer. BOOMBANG: what are these low pressure hgh flow pumps? are they available in engand, u know how much? cheers. (sorry for the hijack! ) Share this post Link to post Share on other sites
boombang 2 Posted October 4, 2006 IIRC its http://www.holley.com/12-801-1.asp Sure Mfield used to use one and yes they are available in the UK. Problem with pressure regulators is by their very nature they restrict flow. Never actually seen a problem http://www.thinkauto.com/acatalog/Price_List_Holley_316.html and see the 801 - cheaper than a facet redtop + regulator and will outflow it. Share this post Link to post Share on other sites
boldy205 75 Posted October 4, 2006 i see very good, i suppose the pump is electric and stops pumping when the floats are full? Share this post Link to post Share on other sites
Trick 1 Posted October 4, 2006 i have a regulator as well....so would i be right in thinking that the regulator may be the problem? or maybe boldy is right and the pump is just not providing enough... do you think those holley pumps are ok to mount in the engine bay Share this post Link to post Share on other sites
Trick 1 Posted October 4, 2006 reading up on the holley 801-1, states you dont need a regulator... but on its calculation it says i`ll be needing about 13 Gallons of fuel per hour, that can kick out 97 @ 7psi. Share this post Link to post Share on other sites
boldy205 75 Posted October 6, 2006 yikes! so how come you dont need a regulator if it pumps out that much? Share this post Link to post Share on other sites
boombang 2 Posted October 6, 2006 "low pressure, high flow Holley pumps" As in they flow a lot but not at high pressure - means there is no excess pressure down on the needles forcing more fuel in... Share this post Link to post Share on other sites
mfield 20 Posted October 6, 2006 Boombang was so nearly correct with the pump i had I had the Carter 4070, which is 4 psi and 70 gph. As stated its the low pressure bit which is the bonus, the floats can hold back about 5/6psi fine iirc go to high and they stay open and flood. I got mine from america in sunny hollywood, http://www.racetep.com/webfuelspark.html Share this post Link to post Share on other sites
boombang 2 Posted October 7, 2006 I knew it was something like that! Both pumps seem to be fairly similar spec. Share this post Link to post Share on other sites
