fuel pump swap

Topic: fuel pump swap (Read 2467 times) previous topic - next topic

fuel pump swap

April 22, 2007, 12:16:38 AM

how hard is it to go from an electric fuel pump to a mechanical one , any info would be greatly welcome, by the way really like the site.

fuel pump swap

Reply #1 – April 22, 2007, 09:45:18 AM

I assume you are switching to carburetor???

fuel pump swap

Reply #2 – April 22, 2007, 04:06:03 PM

yes why else switch to a mechanical pump

fuel pump swap

Reply #3 – April 24, 2007, 09:30:32 PM

you're best bet is to use a low pressure electric pump. I do believe our timing covers aren't machined for a mech fuel pump. And i think the covers that have the fp boss the reverse rotation wp wont bolt up.

louie

fuel pump swap

Reply #4 – April 25, 2007, 08:04:26 AM

i beleive you would first have to know what engine... if its the 5.0 u can get it set up.. there may or may not be mech fuel pump boss. it would be located on drivers side timing cover i beleive. and i do beleive SOME 3.8's also had mechanical fuel pumps

fuel pump swap

Reply #5 – April 26, 2007, 01:08:10 PM

anybody have some info on this low pressure pump, how its set up, and what about the pump in the tank does that stay in or does it come out. boy oh boy lots of ??s thanks ahead of time for any info

fuel pump swap

Reply #6 – April 26, 2007, 05:58:25 PM

What year and what engine are we talking about?

fuel pump swap

Reply #7 – April 26, 2007, 11:33:30 PM

1985 5.0 efi

fuel pump swap

Reply #8 – April 27, 2007, 01:07:06 AM

If it is a T-Bird or Cougar it is a CFI (Central Fuel Injection). It is a carb. type device with two injectors in it.

If you have the two fuel pump system, you have a low pressure pump in the tank and a high pressure pump inline.

The inline pump would be just forward of the right rear wheel and packaged with the fuel filter.

I don't know if the in-tank low pressure pump will support a carb or not. But it may be worth a try.
84FILA was looking into this, but I don.t know how it worked out.

fuel pump swap

Reply #9 – April 27, 2007, 03:03:54 PM

thanks for the info, and your right it is cfi

fuel pump swap

Reply #10 – April 30, 2007, 07:33:14 PM

The low pressure pump will work out fine with a carb. I done the conversion from cfi to carb and used the low pressure pump in the tank.

fuel pump swap

Reply #11 – April 30, 2007, 10:24:09 PM

do you need a regulator or anything like that

fuel pump swap

Reply #12 – May 01, 2007, 12:38:01 AM

i believe that duel fuel pump thing was isolated to the 83 and far and few betwoeen 84's. I also noticed that the duel fuel pump system was associated to the duraspark I system as well IIRC when i was looking into this.

like mentioned, tell us if you have a fuel pump on the filter (highly doubt it on that year though).

either way, if your not going to drill a hole in the tank then dropping it is gonna have to happen. You cant just suck fuel through the existing tank pump and simply hook up an external low presure one. it will cause a volume restriction imho although ive never really tried this.

Most of your external pumps are intended to boost the presure but you may find the lower volume/presure type on the carb'd subaru ect.

External pumps can be found on early 90's vans and trucks but the presure is too high.
Ive often thought about what i would do in your case, i would try running any old elec pump but use an inline rheostat on the hot wire and dial in the resistance required to reduce the RPM of the pump to produce the required psi.
then you could install the correct wattage/resistor.

softtouch,,
yeah i really wish 84fila would get off his a@@:D and get the numbers on that low presure in the tank pump,,as well as the external. i have a note on it waiting on his reading.:D

fuel pump swap

Reply #13 – May 01, 2007, 12:42:16 AM

Quote from: JrP;143903

The low pressure pump will work out fine with a carb. I done the conversion from cfi to carb and used the low pressure pump in the tank.

ok,, perhaps you have the information on the presure. Yours sounds like it was plug and play. What is your fuel presure? what year is that car and which dizzy ign system was it?

fuel pump swap

Reply #14 – May 01, 2007, 09:29:15 AM

Quote from: jcassity;144024

i believe that duel fuel pump thing was isolated to the 83 and far and few betwoeen 84's. I also noticed that the duel fuel pump system was associated to the duraspark I system as well IIRC when i was looking into this.

like mentioned, tell us if you have a fuel pump on the filter (highly doubt it on that year though).

either way, if your not going to drill a hole in the tank then dropping it is gonna have to happen. You cant just suck fuel through the existing tank pump and simply hook up an external low presure one. it will cause a volume restriction imho although ive never really tried this.

Most of your external pumps are intended to boost the presure but you may find the lower volume/presure type on the carb'd subaru ect.

External pumps can be found on early 90's vans and trucks but the presure is too high.
Ive often thought about what i would do in your case, i would try running any old elec pump but use an inline rheostat on the hot wire and dial in the resistance required to reduce the RPM of the pump to produce the required psi.
then you could install the correct wattage/resistor.

softtouch,,
yeah i really wish 84fila would get off his a@@:D and get the numbers on that low presure in the tank pump,,as well as the external. i have a note on it waiting on his reading.:D

Lowering the voltage to the pump would be a very bad idea. Electric motors don't like low voltage - it eats the brushes and commutator bars up. Newer cars with returnless fuel systems use pulse-width-modulation to vary pump speed (but the voltage stays the same).

You can find aftermarket low pressure high volume electric pumps from just about any carb manufacturer (Holley, Edelbrock, etc).

Oh, and just getting a timing cover with fuel pump boss won't get you going, either - you also need something to operate the pump. EFI cams don't have the required lobe on them to operate a mechanical fuel pump. I'm pretty sure you can get a bolt-on fuel pump eccentric for EFI style cams though...