The LeMons 1986 Civic runs great until the fuel level drops below ~1/2 tank, then it starves in hard corners, meaning we have to come in too early to add fuel. I have NO plans to cut open the tank to add baffles etc so was looking into building a small (1 gallon) surge tank. Here's the idea: use a Holley low pressure high volume pump to feed the surge tank, then have the pressure/return lines from the frame mounted high pressure pump plumbed into it as well. My biggest question: do I need to run a return line from the surge tank back to the main tank (on the low pressure side) or do I just plumb the surge tank into the pressure side with no extra return lines?
BigD
New Reader
6/14/11 6:34 a.m.
Surge tank needs an overflow back into the main tank. Just get a bulkhead fitting from Summit, easy. This is what I did for the E30 (two transfer pumps, one in each half of the tank)
my old boss used to use a certain plastic reservoir with a bunch of nipples in various locations plumbed inbetween the in tank pump and the fuel rail lines. i couldnt find the part as i think it was some odd audi sourced thing, but it wasnt too much money (lemons happy) and IIRC used all the factory parts but solved the high G long corner starvation we experienced.
i really like bigD's setup and i'm sure its a lot better, but i'll talk to my old boss for the part# to see if it is a cheaper solution.
On Dr.Linda's Megasquirted Sportster, I put a metal canister EFI fuel filter that holds about a cup between the fuel tank and the high pressure fuel pump, with the return plumbed between the tank the and filter. In cornering, if the tank is low the pump draws from the cup in the filter, which is then refilled by the low pressure fuel pump (gravity) when fuel is available again. She has never experienced a lean corner. The new factory Sportster EFI systems experience lean corners when low on fuel, from what I read.
You could use a VW fuel pump assembly from a MKII golf or jetta. It sits in a surge tank that's fed by an in tank pump and the return from the engine, and overflows back into the tank.
this was an interesting post.... towards the bottom it shows a mkII golf OEM mini surge tank...
http://grassrootsmotorsports.com/forum/grm/help-me-with-fuel-cell-baffling-please/34302/page1/
er ok 16v beat me to it lol...
Even though I get a deathly shiver up my spine whenever VW anything is mentioned, I'm gonna look at that surge tank whenever I get near a boneyard. We thought about a big fuel filter too, I was concerned that is we couldn't mount it in such a way that the fuel would be above the pressure pump it might still starve.
