fuel pump

i have changed my fuel pump from belt driven to cam driven. fuel pump was taking apart to change drive direction and put back together , fuel tank was replaced and put in front of the dragster using 12an line to go to pump. tried to fire motor using gas it will fire but will not suck alcohol thru to the motor. checked all the plumbing lines are in correct location the fuel line has to go up from the tank 4'" to go thru firewall . Is that going to cause fuel pump problems sucking from the tank or could their be a problem we caused taking fuel pump apart

 

Fuel pump change!

I'm no expert on this,but i guess your talking an Enderle pump? My way of thinking is that there pumps should be always "flooded" with fuel as they don't like sucking the fuel up! Also to change rotation the front cover needs to be turned 180 degrees going from belt to cam driven. I think Mike can add to this if he will.

 

What kind of fuel pump do you have ? On Enderle pump you only have to rotate the cover 1/2 turn . Remove the hose from the pump outlet , open the shut-off valve and fill with alcohol , turn the engine slightly by the blower if the alcohol's gone , your pump is not assembled correctly.

 

fuel pump is a enderle 80a pump. The pump was turned 180 degrees and mark on pump cover was in correct location as per instructions from enderle. how do you supply fuel to pump after you empty fuel tank and lines when done for the weekend. the fuel tank is eight feet from pump and pump is higher than fuel lines. do you have to prime fuel pump from the outlet side every weekend.

 

Dry starts on pumps are a no-no.
Remove the main line at the BV. Use a turkey baster and fill the line. You may not get it totally full based on your fuel tank height but it will help wet/prime the pump.

Your new pump height is probably higher than when it was belt driven. This adds to the drama. Make sure tank is full. Normally you only have to do this prime thing the first time of the day...unless your tank runs dry or it's hours between laps.

You are probably just squirting some fuel in there and not adding extra via the bottle once it starts, yes? Hold your primer bottle at the bottom of the center butterfly and tip it so fuel runs out when the engine starts. The vacuum will pull the fuel in. The tipping angle will dictate how much fuel goes in. Use your ears and tip accordingly until the engine is running evenly. Once the alky starts you will hear a change in tone. Stop priming at that point.

If it's a really. really old pump it could be adding to the issue. They wear in one direction and changing the rotation makes them less efficient at low rpm in the new direction.

24 volts to the starter helps quite a bit with starting any injected system.

A one way flapper valve between the tank and the pump can be used to hold fuel in the system for easier starting on subsequent start ups.

Dave Koehler
http://www.koehlerinjection.com

 

Priming the pump!

Dave! what you said about the "dry start" is interesting.If the fuel level in the tank is always kept higher than the pump is the initial prime still neccesary? I'm thinking not as the pump will be constantly "flooded" with fuel at all times.Each time i start the car first off,by the time we've wound it over to get oil up with the mag off,it takes very little gas squirted into the hat at all to run on alky.I guess this is a brand new 110 which would have to help. Jason.

 

Certainly if the tank level is at the same level as the pump inlet or higher then life is good. However, an awful lot of tank levels don't meet that criteria so some help is needed. If in doubt add some fuel through the line.

 

Fuel pump change!

Thanks Dave!!

 

dave who makes a flapper valve that i can put inline to prevent fuel from flowing back to the tank.the fuel line is a 12an. i tried using air pressure into the tank via the return line and had the fuel line removed from the outlet side of the pump and still could not get fuel to run thru pump with motor being cranked. the pump is a new 80a pump just used 1 weekend last year.

 

Fuel pump change!

Pat! somethings definately up right there! Can anyone else help Pat? I'm out of ideas!!

 

Kinsler makes one. -12 to -12

EDB

 

Pat,
I doubt the air trick would work unless you plugged the vent.
There is a question. How big is your vent? Foam in the tank?

Also,
Did you pour some fuel in the pump while you had that line off?
If so, when turned over, did it pump up at you or go the other way or do nothing?

I also don't think you are spinning it fast enough.
Try the line prime thing and use the bottle as described above. Keep it running until the pump runs on it's own.

I just order the one way valves as needed. Call if you want one but be forewarned. They really like those things for some reason. Now,... the valve is not going to help your initial fireup. You still have to do the deal at least once a day.

One last thing to verify. There is a notch on the edge of the front cover. Where is it located on a clock?

Dave Koehler
http://www.koehlerinjection.com

 

Are you sure the pump turn ?
correct shaft length in the pump extension ?

 

The notch on the fuel pump is in the 3:00 position. when i used compressed air to feed the bottom line we had fuel to the bottom inlet side of pump, we reconnected line tried to fire motor no luck. I then used the air to try and get fuel to outlet side of pump cranking the fuel pump while putting air to tank with no luck.the fuel line is located at bottom right side of fuel cell but due to cross braces and tin firewall the fuel line must go up 4" right after fuel line is connected to fuel cell and then is 8 feet long before the fuel pump . the fuel pump inlet is 2.5" above bottom of fuel line . Could i be getting to much air in line for pump to pull fuel thru. I am going to try priming fuel pump from the barrel vave down to fuel pump and see what happens.

 

Also removed pump from extension and turned motor. shaft is correct and is turning with the motor.

 

I did have the same symptons and one point in time and it was a broke pump shaft..good luck and let us know!! Dave
www.myspace.com/daveloweswr

 

problem solved

problem solved . i had to prime pump from the top . did it twice it took a while for pump to suck from tank, around 30 seconds them motor ran on alcohol. Let motor sit for a while and restarted it. it fired without use of fuel twice Just cranked motor and opened throttle a bit and fired right up .
Thanks for all the replies

 

It's ALIVE!!!

Hooray for pat! Seriously though,glad you got it goin' mate! I'm guessing after a few outings you'll get the starting procedure"Down Pat" pardon the punn!! Jason...