 Fuel Pump Questions, Was: FI Wiring Question |
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| ThinAir |
 May 12 2003, 11:10 PM
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#1
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Best friends  Group: Members Posts: 2,543 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region 
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It looks like I've got a bad pump. Everything is plumbed to match Dave Darling's hose diagram and I've checked it against a known good 73. To be sure, I did some additional testing.
The connector that is closest to the electrical hookup is the one that has the T on it to connect to the return line in the tunnel and to the fuel pressure regulator. I'm testing by hooking the gauge directly to the center outlet of the pump. If I clamp between the T and the fuel pressure regulator, I get about 1 psi on the gauge. If I clamp between the T and the tube in the tunnel, I get about 10 psi. If I test with no lines clamped, I get about 5 psi. I bought this pump a few months back and have never used it until now. The Haynes manual says that the pre-72 and 72-74 pumps are "similar". I don't know for sure what year this one came out of. Does anyone know if there are any differences between pumps? Like, should the two "outside" hose connections be reversed? Does any of this information give anyone a clue about what is going on? |
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| ThinAir |
May 13 2003, 12:15 AM
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#2
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Best friends Group: Members Posts: 2,543 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region
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Anybody ever try an MSD pump as a replacement?
http://store.summitracing.com/default.asp?...-2225&x=16&y=12 At $80 it's a lot less intimidating than $300 (Pelican's Price for stock)! |
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| Brad Roberts |
May 13 2003, 12:18 AM
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#3
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
WOW.
I like it. I paid close to 500$ for my injection pump (good for 1100hp) they must have recently released this one. Buy it. Use it. Tell us how great it is. I see NO reason why it wont work. B |
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| Mike9142.0 |
May 13 2003, 12:24 AM
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#4
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Member Group: Members Posts: 219 Joined: 29-January 03 From: Phoenix, AZ Member No.: 208 Region Association: Southwest Region |
Can you just take the return from the press regulator and go to the tank with out the one from the stock pump?
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| Brad Roberts |
May 13 2003, 12:26 AM
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#5
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Correct a mundo. Take it straight from the regulator and pipe it to the return.
B |
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| Mike9142.0 |
May 13 2003, 12:29 AM
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#6
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Member Group: Members Posts: 219 Joined: 29-January 03 From: Phoenix, AZ Member No.: 208 Region Association: Southwest Region |
Thanks Brad.
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| ThinAir |
May 13 2003, 12:51 AM
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#7
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Best friends Group: Members Posts: 2,543 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region
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Cool. I've got a Bosch pump # 0580463010 that I found that I'm gonna try first. It's the same setup: 1 inlet, 1 outlet. It spins so I'm hopeful that I can use it. If it don't work, then I'll try the MSD pump. We'll see how it turns out tomorrow night after work!
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| Gint |
May 13 2003, 07:40 AM
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#8
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Mike Ginter Group: Admin Posts: 16,082 Joined: 26-December 02 From: Denver CO. Member No.: 20 Region Association: Rocky Mountains  |
It sounds a lot to me like you have a factory /6 pump for use with carbs. They look just like the FI pump. What's the part number on that pump?
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| Dave_Darling |
May 13 2003, 11:25 AM
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#9
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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The stock pumps (70-74) have small labels next to the fittings. "S", "D", and "R".
S stands for Suction (or rather, the German equivalent which also starts with S). D stands for Druck, which is German for Pressure. R stands for the German word for Return. So you hook up the larger center tunnel line to the fuel filter and then to the S port. You hook up the D port to the right-side fuel rail. You hook up the R port to the "Y" fitting that connects to the Fuel Pressure Regulator and also to the smaller center tunnel line going back to the fuel tank. Any pump should be fine--as long as it puts out enough pressure and volume. Pumps that do not have an "R" port are fine, just remove the "Y" fitting and plumb the FPR directly to the smaller center tunnel line. --DD |
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| ThinAir |
May 13 2003, 09:36 PM
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#10
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Best friends Group: Members Posts: 2,543 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region
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It's ALIVE!!!!
Sure enough, there was something "wrong" with the fuel pump. The 75-76 style pump runs it just fine! Unfortunately, the "new" pump is seeping fuel from around where the casing crimps around the plastic on the outlet end, so I still have to get something else. I'll be in Phoenix this weekend and I'll either get one of those MSD pumps (if I can find a local source) or I can get a new 75-76 pump at BAP. I'm not sure that there is anything actually "wrong" with the pump that didn't work. Mike Ginter's comment is interesting. The only part number I can find anywhere on the pump is stamped into the end. It is 0580960009. I can't make that match up with anything at Pelican's site. Does anyone recognize this number? Thanks to all for your assistance on this project. I sure couldn't have done it without the help of the group! I can hardly wait to (IMG:style_emoticons/default/driving.gif) it again!!! |
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