EFI Fuel Pump Upgrade

[woody80z28]

Something I will need to do with the Camaro as well. I need a new tank though anyway...so I can just weld the ring on rather than doing a gasket with rivnuts. I also thought about leaving my stock sending unit in place for the gauge and adding the pump in a new hole.

[gregs78cam]

Thanks guys, I have been meaning to get the thing layed out in the thread for a while.

Something I will need to do with the Camaro as well. I need a new tank though anyway...so I can just weld the ring on rather than doing a gasket with rivnuts. I also thought about leaving my stock sending unit in place for the gauge and adding the pump in a new hole.

I have a friend that is going to put one in his mustang and he is planning on welding the ring to the tank. Also if you need the newer sending unit ohm range, there are modules that have them, that way you only have one hole. The racetronix module mentioned has the newer sending unit. I think if you get one out of a '93-'95 S10 it should have the newer sending unit.

[woody80z28]

IIRC the stock '80 sending unit is 0-90ohms, I'm not sure what the newer ones are...but my main reason to keep the stock sending unit would be the accuracy without modifying the float. Is there a stop on it to see full float and full drop (0ohm and 90ohm positions) to modify it to work correctly at the new tank depth?

[gregs78cam]

yup the arm only travels so far. In the second to last pic you can see the stop at the top of the travel.

[bing98]

Outstanding work Greg. I'm putting an L67 into my 72 Nova and would like to us this setup, but my tank is only 7 3/8 deep. How small does this set up get when compressed?

Also, I found a similar setup here http://vetteworksonline.net/ls1_conversion_fuel.htm using an LS1 F-body pump. According to them this pump has a built in regulator which allows them to do the following to eliminate the need for a return line. This is ideal as it will save me money and time running the extra line.



Another suggestion to eliminate the need for a return line was to use a 99 and up Vette filter/regulator at the tank.











What did you do for a filter/regulator?

Thanks

[gregs78cam]

Thanks, as far a compressed height, I will have to measure one. There are a couple of different style buckets with different compressed heights, but just from memory 7 3/8 may not be enough room.

Yea I looked at the VetteWorks stuff, but it was out of the budget, so I made due with what I could find.

For a filter I am using an Earls -6AN inline filter and a SummitRacing deadhead regulator that I modified to be a bypass type after the throttle bodies.

With an MPFI setup, the line pressure with deadhead plumbing is high enough that there is really no 'lag' between injectors going wide open and the regulator closing off bypass flow way back at the pump, but with TBI pressures the regulator NEEDS to be near the engine.

[EagleMark]

I couldn't get one to work when I did that shallow long tank from an IH truck. IIRC it had 9 inches to work with and was close, but still no go after cutting the spring loaded posts down. Unless you can find a shorter bucket?

The pumps without a return line that come on newer rigs ar PWM and have PCM controls. Would be a sweet setup if that one did have a regulator in pump.

But if it's not designed to be returnless it's got to be a heavy burdon on pump designed to flow freely, without flow it would built up heat and without flow not cool?