Reply to thread

Message: [QUOTE="TARM, post: 1423371, member: 578"] You can get fuel flow at the hieght of the HPOP possibly and if it does you have to consider the entire system routing in terms of height and return. Its possible that once you have fuel flow up to and thru the point the return feed to the tank is creating the pressure drop and thus allowing for the fuel flow. Here is a way to see drain hose system so only fuel is in the tank. Reprime just the siphon part and then go up to the HPOP and open that hose I bet the system will not push fuel up to the top of the HPOP location. Its the return line that is creating the flow as a secondary siphon. Here is how I broke down the various choices in +/- when it came to sumps siphons surge tanks Negatives: * Cost * Modifying OEM Dot Approved Fuel Tank ( cutting hole in bottom) * Putting hoses and sump itself in a position that greatly increases exposure to getting damaged and dumping tank of fuel' * Possible leaving one open to very large clean up bill if the above happens * Does not creating any more flow or help fuel pump in any way over siphon Positives: * adds a small volume reserve as it becomes lowest point in fuel tank allowing sump port to stay fuel covered at very low tank fuel levels. Siphon: *Keeps OEM tank unmodified. * Does not change fuel line routing or increase damage risk * Has same head pressure and flow rate as sump * Breaking siphon will stop fuel flow from damaged hose or fitting. * Addition of a surge tank all other areas left (fuel pump location etc) Negatives: Has parts inside tank requiring dropping tank to work on should the need arise which is extremely low after typical 5/8 PU install. Addition of surge tank to siphon system: Positives: Ensures constant fuel supply for pump in low fuel sloshing situations and or at extreme angles. ( more supply than sump). Adds no increased exposure to fuel loss besides the addition of fittings. Can be mounted anywhere along frame rail. Not very costly No tank modifications Keeps factory style siphon fuel pu system Various designs can allow for mounting actual pump inside surge tank thus allowing numerous other benefits or can stay as basic as a small metal or even poly tank inline pre fuel pump pre or post water sep filter. Negatives: Having to re route fuel line thru it. Increases points of failure by adding more fittings. [/QUOTE]