Installing Edelbrock MPFI - which fuel pump?
 

Hi there,

I am about to install an Edelbrock MPFI on my AMC 360-powered-CJ-7. The
system only comes with a high pressure EXTERNAL pump to be installed
near the gas tank at the lowest position possible...

I have been reading lots of good info here about the problems of
running only an external high pressure fuel pump... The question is: Is
it a good idea to install an intermediate low pressure/high volume
EXTERNAL fuel pump to feed the high pressure pump? Or is it better to
try to adapt an intank pump on my 20 gal poly tank? If the in-tank pump
is the way to go, which one (brand/capacity) would you recommend?

Thanks a lot in advance

- Pablo

1981 CJ-7 Laredo 360V8
2000 WJ Laredo QD 4.7V8
2002 Isuzu Trooper 3.2 V6

Re: Installing Edelbrock MPFI - which fuel pump?
 

Does a YJ tank fit here? If so, I would use the tank and pump from one.

External high pressure pumps don't suck. That is why they don't work very
well with FI systems. My '77 Bug had one of the early systems. The
external pump had an inlet of at least 12mm. It was straight down from the
bottom of the tank, to the pump inlet. Any other configuration, and you are
begging for problems with the inlet losing its prime.

Earle

"pablorCJ7" <pabloriofriog@hotmail.com> wrote in message
news:1142962587.934071.82160@e56g2000cwe.googlegro ups.com...
> Hi there,
>
> I am about to install an Edelbrock MPFI on my AMC 360-powered-CJ-7. The
> system only comes with a high pressure EXTERNAL pump to be installed
> near the gas tank at the lowest position possible...
>
> I have been reading lots of good info here about the problems of
> running only an external high pressure fuel pump... The question is: Is
> it a good idea to install an intermediate low pressure/high volume
> EXTERNAL fuel pump to feed the high pressure pump? Or is it better to
> try to adapt an intank pump on my 20 gal poly tank? If the in-tank pump
> is the way to go, which one (brand/capacity) would you recommend?
>
> Thanks a lot in advance
>
> - Pablo
>
> 1981 CJ-7 Laredo 360V8
> 2000 WJ Laredo QD 4.7V8
> 2002 Isuzu Trooper 3.2 V6
>

Re: Installing Edelbrock MPFI - which fuel pump?
 

Does a YJ tank fit here? If so, I would use the tank and pump from one.

External high pressure pumps don't suck. That is why they don't work very
well with FI systems. My '77 Bug had one of the early systems. The
external pump had an inlet of at least 12mm. It was straight down from the
bottom of the tank, to the pump inlet. Any other configuration, and you are
begging for problems with the inlet losing its prime.

Earle

"pablorCJ7" <pabloriofriog@hotmail.com> wrote in message
news:1142962587.934071.82160@e56g2000cwe.googlegro ups.com...
> Hi there,
>
> I am about to install an Edelbrock MPFI on my AMC 360-powered-CJ-7. The
> system only comes with a high pressure EXTERNAL pump to be installed
> near the gas tank at the lowest position possible...
>
> I have been reading lots of good info here about the problems of
> running only an external high pressure fuel pump... The question is: Is
> it a good idea to install an intermediate low pressure/high volume
> EXTERNAL fuel pump to feed the high pressure pump? Or is it better to
> try to adapt an intank pump on my 20 gal poly tank? If the in-tank pump
> is the way to go, which one (brand/capacity) would you recommend?
>
> Thanks a lot in advance
>
> - Pablo
>
> 1981 CJ-7 Laredo 360V8
> 2000 WJ Laredo QD 4.7V8
> 2002 Isuzu Trooper 3.2 V6
>

Re: Installing Edelbrock MPFI - which fuel pump?
 

Does a YJ tank fit here? If so, I would use the tank and pump from one.

External high pressure pumps don't suck. That is why they don't work very
well with FI systems. My '77 Bug had one of the early systems. The
external pump had an inlet of at least 12mm. It was straight down from the
bottom of the tank, to the pump inlet. Any other configuration, and you are
begging for problems with the inlet losing its prime.

Earle

"pablorCJ7" <pabloriofriog@hotmail.com> wrote in message
news:1142962587.934071.82160@e56g2000cwe.googlegro ups.com...
> Hi there,
>
> I am about to install an Edelbrock MPFI on my AMC 360-powered-CJ-7. The
> system only comes with a high pressure EXTERNAL pump to be installed
> near the gas tank at the lowest position possible...
>
> I have been reading lots of good info here about the problems of
> running only an external high pressure fuel pump... The question is: Is
> it a good idea to install an intermediate low pressure/high volume
> EXTERNAL fuel pump to feed the high pressure pump? Or is it better to
> try to adapt an intank pump on my 20 gal poly tank? If the in-tank pump
> is the way to go, which one (brand/capacity) would you recommend?
>
> Thanks a lot in advance
>
> - Pablo
>
> 1981 CJ-7 Laredo 360V8
> 2000 WJ Laredo QD 4.7V8
> 2002 Isuzu Trooper 3.2 V6
>

Re: Installing Edelbrock MPFI - which fuel pump?
 

Does a YJ tank fit here? If so, I would use the tank and pump from one.

External high pressure pumps don't suck. That is why they don't work very
well with FI systems. My '77 Bug had one of the early systems. The
external pump had an inlet of at least 12mm. It was straight down from the
bottom of the tank, to the pump inlet. Any other configuration, and you are
begging for problems with the inlet losing its prime.

Earle

"pablorCJ7" <pabloriofriog@hotmail.com> wrote in message
news:1142962587.934071.82160@e56g2000cwe.googlegro ups.com...
> Hi there,
>
> I am about to install an Edelbrock MPFI on my AMC 360-powered-CJ-7. The
> system only comes with a high pressure EXTERNAL pump to be installed
> near the gas tank at the lowest position possible...
>
> I have been reading lots of good info here about the problems of
> running only an external high pressure fuel pump... The question is: Is
> it a good idea to install an intermediate low pressure/high volume
> EXTERNAL fuel pump to feed the high pressure pump? Or is it better to
> try to adapt an intank pump on my 20 gal poly tank? If the in-tank pump
> is the way to go, which one (brand/capacity) would you recommend?
>
> Thanks a lot in advance
>
> - Pablo
>
> 1981 CJ-7 Laredo 360V8
> 2000 WJ Laredo QD 4.7V8
> 2002 Isuzu Trooper 3.2 V6
>

Re: Installing Edelbrock MPFI - which fuel pump?
 

From what I understand, the issue is the tank design. There is no
baffle around the pickup so when you do a corner or a hill with less
than quarter a tank in it it can suck air and stall out the engine.

I do not know if any pumps can make up for this or if you would need to
fit a new/old tank with the pump.....

I know the return line goes into a cooling jacket on a lot of pumps, but
do not know if there is a gas pickup in this jacket.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

pablorCJ7 wrote:
>
> Hi there,
>
> I am about to install an Edelbrock MPFI on my AMC 360-powered-CJ-7. The
> system only comes with a high pressure EXTERNAL pump to be installed
> near the gas tank at the lowest position possible...
>
> I have been reading lots of good info here about the problems of
> running only an external high pressure fuel pump... The question is: Is
> it a good idea to install an intermediate low pressure/high volume
> EXTERNAL fuel pump to feed the high pressure pump? Or is it better to
> try to adapt an intank pump on my 20 gal poly tank? If the in-tank pump
> is the way to go, which one (brand/capacity) would you recommend?
>
> Thanks a lot in advance
>
> - Pablo
>
> 1981 CJ-7 Laredo 360V8
> 2000 WJ Laredo QD 4.7V8
> 2002 Isuzu Trooper 3.2 V6

Re: Installing Edelbrock MPFI - which fuel pump?
 

From what I understand, the issue is the tank design. There is no
baffle around the pickup so when you do a corner or a hill with less
than quarter a tank in it it can suck air and stall out the engine.

I do not know if any pumps can make up for this or if you would need to
fit a new/old tank with the pump.....

I know the return line goes into a cooling jacket on a lot of pumps, but
do not know if there is a gas pickup in this jacket.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

pablorCJ7 wrote:
>
> Hi there,
>
> I am about to install an Edelbrock MPFI on my AMC 360-powered-CJ-7. The
> system only comes with a high pressure EXTERNAL pump to be installed
> near the gas tank at the lowest position possible...
>
> I have been reading lots of good info here about the problems of
> running only an external high pressure fuel pump... The question is: Is
> it a good idea to install an intermediate low pressure/high volume
> EXTERNAL fuel pump to feed the high pressure pump? Or is it better to
> try to adapt an intank pump on my 20 gal poly tank? If the in-tank pump
> is the way to go, which one (brand/capacity) would you recommend?
>
> Thanks a lot in advance
>
> - Pablo
>
> 1981 CJ-7 Laredo 360V8
> 2000 WJ Laredo QD 4.7V8
> 2002 Isuzu Trooper 3.2 V6

Re: Installing Edelbrock MPFI - which fuel pump?
 

From what I understand, the issue is the tank design. There is no
baffle around the pickup so when you do a corner or a hill with less
than quarter a tank in it it can suck air and stall out the engine.

I do not know if any pumps can make up for this or if you would need to
fit a new/old tank with the pump.....

I know the return line goes into a cooling jacket on a lot of pumps, but
do not know if there is a gas pickup in this jacket.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

pablorCJ7 wrote:
>
> Hi there,
>
> I am about to install an Edelbrock MPFI on my AMC 360-powered-CJ-7. The
> system only comes with a high pressure EXTERNAL pump to be installed
> near the gas tank at the lowest position possible...
>
> I have been reading lots of good info here about the problems of
> running only an external high pressure fuel pump... The question is: Is
> it a good idea to install an intermediate low pressure/high volume
> EXTERNAL fuel pump to feed the high pressure pump? Or is it better to
> try to adapt an intank pump on my 20 gal poly tank? If the in-tank pump
> is the way to go, which one (brand/capacity) would you recommend?
>
> Thanks a lot in advance
>
> - Pablo
>
> 1981 CJ-7 Laredo 360V8
> 2000 WJ Laredo QD 4.7V8
> 2002 Isuzu Trooper 3.2 V6

Re: Installing Edelbrock MPFI - which fuel pump?
 

From what I understand, the issue is the tank design. There is no
baffle around the pickup so when you do a corner or a hill with less
than quarter a tank in it it can suck air and stall out the engine.

I do not know if any pumps can make up for this or if you would need to
fit a new/old tank with the pump.....

I know the return line goes into a cooling jacket on a lot of pumps, but
do not know if there is a gas pickup in this jacket.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

pablorCJ7 wrote:
>
> Hi there,
>
> I am about to install an Edelbrock MPFI on my AMC 360-powered-CJ-7. The
> system only comes with a high pressure EXTERNAL pump to be installed
> near the gas tank at the lowest position possible...
>
> I have been reading lots of good info here about the problems of
> running only an external high pressure fuel pump... The question is: Is
> it a good idea to install an intermediate low pressure/high volume
> EXTERNAL fuel pump to feed the high pressure pump? Or is it better to
> try to adapt an intank pump on my 20 gal poly tank? If the in-tank pump
> is the way to go, which one (brand/capacity) would you recommend?
>
> Thanks a lot in advance
>
> - Pablo
>
> 1981 CJ-7 Laredo 360V8
> 2000 WJ Laredo QD 4.7V8
> 2002 Isuzu Trooper 3.2 V6

Re: Installing Edelbrock MPFI - which fuel pump?
 

I would use the pump Edelbrock design to use with their electronic
injection. The fact that you're trying to feed 360" (over 60 gallons an
hour) a bigger engine than most stock gasoline engine nowadays, means if
you used an in tank pump and especially if you slowed down the flow by
trying put a regular carburated electric pump and that would surely
screw up the return line. On a high performance engine it could lean out
and melt the pistons the first time you pulled for ten seconds, like a
quarter mile, or hill climb.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

pablorCJ7 wrote:
>
> Hi there,
>
> I am about to install an Edelbrock MPFI on my AMC 360-powered-CJ-7. The
> system only comes with a high pressure EXTERNAL pump to be installed
> near the gas tank at the lowest position possible...
>
> I have been reading lots of good info here about the problems of
> running only an external high pressure fuel pump... The question is: Is
> it a good idea to install an intermediate low pressure/high volume
> EXTERNAL fuel pump to feed the high pressure pump? Or is it better to
> try to adapt an intank pump on my 20 gal poly tank? If the in-tank pump
> is the way to go, which one (brand/capacity) would you recommend?
>
> Thanks a lot in advance
>
> - Pablo
>
> 1981 CJ-7 Laredo 360V8
> 2000 WJ Laredo QD 4.7V8
> 2002 Isuzu Trooper 3.2 V6