Electrical pump a success

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Gregg
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Electrical pump a success

Post by Gregg »

BEFORE: For anybody following and /or finding amusement in this thread, heres an update.

Yes, I finally figured that out fellas (pump/regulator pressure needs some resistence to engage). I put a fuel pressure gauge on the second output on the Holley regulator. I hooked all the line back up and fired up the engine and the guage read 3.5 psi on the carter 4070 (which is close to the rear tank). The bronco ran fine but the regulator had no effect on the psi (probably to low). I swapped in the Holley Red pump and moved it just after tank selector valve (to be able to use the front tank on the same pump if needed-I heard it worked for some people on CB.com).

Results:
Holley Red Pump after tank selector valve:
psi went to 5.5
regulator could not increase pressure but could decrease it down to 3.5psi
bronco seemd to idle fine and handle increased rpms
Pump became hot to the touch (it is very far from any heat source)

I'd like to have more adjustability and the hot pump concerns me. I'm thinking the pump is working too hard to pull the fuel resulting in a higher temp and decreased psi. In the morning I'll check this thread first and then move the holley pump back to the rear tank...Unless there are other ideas.

Later--I'm gonna get a beer and call it a night!

AFTER:
Moved the Holley pump to the rear with an inline filter before it
LIne up to regulator
I can adjust the pressure from 3.5 up to 6.75psi
Bronco fires up and sounds great.
I just need to lock it all into place with some heat shielding by the exhaust and I'm ready to roll.

Thanks for any advice some of you gave over at CB.com

READY TO WHEEL
Definition of cool.
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Rox Crusher
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Re: Electrical pump a success

Post by Rox Crusher »

Sounds great, glad you got it figured out and fixed.

Seeing how prevalent these vapor lock issues are makes me wonder if it was as big of a problem back in the day or if it is a result of our higher driving speeds, etc.

Anyway, your ready to wheel now so let's start planning a trip to MSV and Coney.
1977 Sport, 351w OBDII EFI motor, 4R70W auto, 4:88 gears, ARB lockers, 3.5" suspension, 33" tires.
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ZOSO
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Re: Electrical pump a success

Post by ZOSO »

They had better gas back then. Todays gas just sucks.
Rob

74 Ranger EFI351w, 4r70w, ARB 5.13 9in, ARB 5.13D44, and a bunch of other goodies. Best of all the family memories.

04 Mustang Cobra, KenneBell 2.2 feeding a lot of boost on E85. Tire shredding machine

New project: 77 Bronco Ranger, body work and more body work.

Very little left of a 72 durango tan explorer sport
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Gregg
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Re: Electrical pump a success

Post by Gregg »

Rox Crusher wrote:Sounds great, glad you got it figured out and fixed.

Seeing how prevalent these vapor lock issues are makes me wonder if it was as big of a problem back in the day or if it is a result of our higher driving speeds, etc.

Anyway, your ready to wheel now so let's start planning a trip to MSV and Coney.



You bet Rox! Summer or Fall Trip?
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Booger
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Re: Electrical pump a success

Post by Booger »

What ZOSO said. Today's gas has alcohol in it even during the summer. That lowers the boiling point causing more fuel related issues when it's hot. Remember water boils at a lower temp the higher you climb so would gas boil at a lower temp the higher you climb? I remember rarely did I have or see a vapor lock issue.
Bob - Turning hydrocarbons into noise since 1970

Spiritual owner of the now Zoso mobile (1974 Bronco Ranger - EFI 351W-4R70W-ARB front and rear-STC softtop- High Country hood-3 1/2" WH lift- Cross inboard rear shock mnt- Duffs bumpers- Warn 8274- 33's- Cheby disc conversion)
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