Anyone with an Inline fuel pump!!! Please help!
Thread Starter
Racer
Joined: Nov 1999
Posts: 434
Likes: 0
From: Plaistow NH
I have a inline fuel pump and I need some info on what fittings I need to install it.
The input on the pump is just a smooth ummmm errr nipple, and the output is a female AN type fitting, I think it's either 6 or 8.. whichever is smaller..
I understand I need to fabricate a pickup for in the tank, but what else from there?
Should the pump be mounted below the tank or above it? or right behind the lic. plate.
The fittings going from the tank to the pump would be pretty low pressure I assume, and the ones from the pump to the filter is what I should be worried about.
ANY help is good help
Bill
The input on the pump is just a smooth ummmm errr nipple, and the output is a female AN type fitting, I think it's either 6 or 8.. whichever is smaller..
I understand I need to fabricate a pickup for in the tank, but what else from there?
Should the pump be mounted below the tank or above it? or right behind the lic. plate.
The fittings going from the tank to the pump would be pretty low pressure I assume, and the ones from the pump to the filter is what I should be worried about.
ANY help is good help
Bill
Instructor
Joined: Jan 2001
Posts: 104
Likes: 0
From: S.F./Bay Area ,CA.
BillRed85: I haven't replied to any of your posts due to the mechanical conundrum you pose to the performance community!
As far as the inline(external) fuel pump, once again your decision process perplexes me! Most high-pressure, inline fuel pumps are optimized for media outlet pressure, not vacuum. This can pose problems at start-up, especially if the vehicle has been parked for awhile. This is due to relatively poor prime ability of the pump, due to cavitation.
This is why most American FI vehicles have in-tank pumps, ease of pump prime, plus the benefits of liquid cooling. You will find that most European Mfg. which implement inline FI pump units, use Bosch GmbH because of their unique design.
There are many cheap, reliable 190 & 255LPH in-tank units, which just drop in by various Mfg.'s
BTW, Holley states the following about their In-Tank fuel pumps:
"These pumps come in three types 190lph, 255lph standard and the forced induction 255lph. The Forced Induction pump flows significantly more fuel at higher pressure. For example at 80 p.s.i. the standard 255lph will flow 35 gph at that same 80 p.s.i. the equivalent Forced Induction pump will flow 50gph. These equate to the following:
155 lph = 41 gph = 246 lbs of fuel = 491 hp
190 lph = 50 gph = 301 lbs of fuel = 600 hp
255 lph = 67 gph = 404 lbs of fuel = 800 hp"
If you really want an external pump, go for it! Just keep in mind, they have higher odds of developing leaks due to modified/custom fuel lines, cost more, require custom wiring, and if your seriously looking for "the quietest mufflers that I can find", I really doubt you'll need more than a 255lph pump! Just my 2-cents.
[This message has been edited by RU4L98 (edited 07-23-2001).]
As far as the inline(external) fuel pump, once again your decision process perplexes me! Most high-pressure, inline fuel pumps are optimized for media outlet pressure, not vacuum. This can pose problems at start-up, especially if the vehicle has been parked for awhile. This is due to relatively poor prime ability of the pump, due to cavitation.
This is why most American FI vehicles have in-tank pumps, ease of pump prime, plus the benefits of liquid cooling. You will find that most European Mfg. which implement inline FI pump units, use Bosch GmbH because of their unique design.
There are many cheap, reliable 190 & 255LPH in-tank units, which just drop in by various Mfg.'s
BTW, Holley states the following about their In-Tank fuel pumps:
"These pumps come in three types 190lph, 255lph standard and the forced induction 255lph. The Forced Induction pump flows significantly more fuel at higher pressure. For example at 80 p.s.i. the standard 255lph will flow 35 gph at that same 80 p.s.i. the equivalent Forced Induction pump will flow 50gph. These equate to the following:
155 lph = 41 gph = 246 lbs of fuel = 491 hp
190 lph = 50 gph = 301 lbs of fuel = 600 hp
255 lph = 67 gph = 404 lbs of fuel = 800 hp"
If you really want an external pump, go for it! Just keep in mind, they have higher odds of developing leaks due to modified/custom fuel lines, cost more, require custom wiring, and if your seriously looking for "the quietest mufflers that I can find", I really doubt you'll need more than a 255lph pump! Just my 2-cents.
[This message has been edited by RU4L98 (edited 07-23-2001).]
Thread Starter
Racer
Joined: Nov 1999
Posts: 434
Likes: 0
From: Plaistow NH
Chris,
I went with the BOSCH inline pump under recomendation from an EMIC location who sounded like they knew what they were doing. But I'm open to sugestion if you think the intank is the way to go. The bosch is a 900+HP pump I think, not sure.
I have 48lb injectors and I'm going to be running upwards of 15psi of boost so I thought I needed a bigger pump.
And another thing!! The quietest muffler post is to get a state inspection sticker!
AND I'll have you know I had to goto dictionary.com to see what a conundrum was! hah
Bill
I went with the BOSCH inline pump under recomendation from an EMIC location who sounded like they knew what they were doing. But I'm open to sugestion if you think the intank is the way to go. The bosch is a 900+HP pump I think, not sure.
I have 48lb injectors and I'm going to be running upwards of 15psi of boost so I thought I needed a bigger pump.
And another thing!! The quietest muffler post is to get a state inspection sticker!
AND I'll have you know I had to goto dictionary.com to see what a conundrum was! hah
Bill
Instructor
Joined: Jan 2001
Posts: 104
Likes: 0
From: S.F./Bay Area ,CA.
Bill:
Sorry about flaming ya, it's just that I've read some responses of yours, which contained high concentrations of Napalm! So now that we're past that, I'm rather curious as to why you're planing to run 48Lb/Hr Injectors. If I can remember your combo right, it goes something like this: 383 with S/R, 15PSI of centrifugal boost. I'll assume you plan on using hydraulic Roller Lifters/Cam, so you're window of operation ends @ 6500RPM's. I predict (could be wrong) that you'll never come close to injector pulse saturation, and have a royal pain in the a$$ trying to dial in the A/F at idle! I would suggest talking with a few tuners about your application, and see what their recommendations are for injector sizing. I'm betting 30-36pounder's will be more than enough for your redline and boost level.
BTW, good choice on the Bosch, they have the highest MTBF of external FI pumps. But they work best when mounted bellow the pickup tube opening, to assure they're gravity fed at turn on. I'm still wondering why go though the troubles of recreating the wheel, when the O.E. layout will more than suffice with a high volume, aftermarket pump unit? After all, it's just a drop in replacement!
Chris
Sorry about flaming ya, it's just that I've read some responses of yours, which contained high concentrations of Napalm! So now that we're past that, I'm rather curious as to why you're planing to run 48Lb/Hr Injectors. If I can remember your combo right, it goes something like this: 383 with S/R, 15PSI of centrifugal boost. I'll assume you plan on using hydraulic Roller Lifters/Cam, so you're window of operation ends @ 6500RPM's. I predict (could be wrong) that you'll never come close to injector pulse saturation, and have a royal pain in the a$$ trying to dial in the A/F at idle! I would suggest talking with a few tuners about your application, and see what their recommendations are for injector sizing. I'm betting 30-36pounder's will be more than enough for your redline and boost level.
BTW, good choice on the Bosch, they have the highest MTBF of external FI pumps. But they work best when mounted bellow the pickup tube opening, to assure they're gravity fed at turn on. I'm still wondering why go though the troubles of recreating the wheel, when the O.E. layout will more than suffice with a high volume, aftermarket pump unit? After all, it's just a drop in replacement!
Chris
