Type 1 Mechanical Fuel Pump Inlet/Outlet
- dtrumbo
- IAC Addict!
- Location: Mill Creek, WA
- Status: Offline
Type 1 Mechanical Fuel Pump Inlet/Outlet
Hi all,
As I should, I have a Type 1 (upright) engine in my wife's '70 bus. It has the mechanical fuel pump that lives right next door to the distributor. This bus has an alternator so the pump is the kind that has it's head cocked to the side like your dog when he's confused. Speaking of confused, I didn't pay attention when I disconnected the hoses and now I'm wondering which is the input and which is the output of the fuel pump. I believe the input to the pump from the tank was connected to the upper nipple and the output from the pump to the carburetor(s in my case) was connected to the lower nipple. Can someone confirm how they're supposed to be hooked up if it even matters? I'll spare you the gory details of why I had to disconnect the fuel pump until I'm certain of what I think I know and can articulate it in a helpful way very much unlike this sentence.
As I should, I have a Type 1 (upright) engine in my wife's '70 bus. It has the mechanical fuel pump that lives right next door to the distributor. This bus has an alternator so the pump is the kind that has it's head cocked to the side like your dog when he's confused. Speaking of confused, I didn't pay attention when I disconnected the hoses and now I'm wondering which is the input and which is the output of the fuel pump. I believe the input to the pump from the tank was connected to the upper nipple and the output from the pump to the carburetor(s in my case) was connected to the lower nipple. Can someone confirm how they're supposed to be hooked up if it even matters? I'll spare you the gory details of why I had to disconnect the fuel pump until I'm certain of what I think I know and can articulate it in a helpful way very much unlike this sentence.
- Dick
1970 Transporter. 2015cc, dual Weber IDF 40's
1978 Riviera Camper. Bone stock GE 2.0L F.I.
1979 Super Beetle convertible.
... as it turns out, it was the coil!
1970 Transporter. 2015cc, dual Weber IDF 40's
1978 Riviera Camper. Bone stock GE 2.0L F.I.
1979 Super Beetle convertible.
... as it turns out, it was the coil!
- sped372
- IAC Addict!
- Location: Waunakee, WI
- Status: Offline
Re: Type 1 Mechanical Fuel Pump Inlet/Outlet
It does matter, but it can be different from pump to pump. There's no hard and fast rule to which is 'in' and which is 'out' based on my experience.
1971 Karmann Ghia - 1600 DP
1984 Westfalia - 1.9 WBX
1984 Westfalia - 1.9 WBX
- ruckman101
- Lord God King Bwana
- Location: Up next to a volcano.
- Contact:
- Status: Offline
Re: Type 1 Mechanical Fuel Pump Inlet/Outlet
I believe mine go into the bottom and pumps out of the top to the carb.
neal
neal
The slipper has no teeth.
- hambone
- Post-Industrial Non-Secular Mennonite
- Location: Portland, Ore.
- Status: Offline
Re: Type 1 Mechanical Fuel Pump Inlet/Outlet
My vote is top too. Wurst-case hook up the pump and see what it does.
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http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
- SlowLane
- IAC Addict!
- Location: Livermore, CA
- Status: Offline
Re: Type 1 Mechanical Fuel Pump Inlet/Outlet
With the +12V wire disconnected from your coil and carefully avoiding any contact with the fan-belt and pulleys by hair/skin/neckties/pets, gently put two of your fingers over the two pump ports. Ask your wife to crank the engine a few turns. You should feel slight suction on one port and the other port should "puff" your other finger away. Suction port goes to tank, puffing port goes to carb.
'81 Canadian Westfalia (2.0L, manual), now Californiated
"They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance."
- Terry Pratchett
"They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance."
- Terry Pratchett
- dtrumbo
- IAC Addict!
- Location: Mill Creek, WA
- Status: Offline
Re: Type 1 Mechanical Fuel Pump Inlet/Outlet
Wife? We don't need no steenking wife! I gots me one o' these!SlowLane wrote:Ask your wife to crank the engine a few turns.
Attempted comedy aside, that's an excellent plan. I looked at older pictures and I'm pretty sure the inlet to the pump is/was the top nipple. But the new pump isn't the old pump so double-checking using the SlowLane method makes even more sense. I need to use the no-start-but-run-the-pump method anyway to check fuel pressure. Dual Webers no likey excessive fuel pressure.
- Dick
1970 Transporter. 2015cc, dual Weber IDF 40's
1978 Riviera Camper. Bone stock GE 2.0L F.I.
1979 Super Beetle convertible.
... as it turns out, it was the coil!
1970 Transporter. 2015cc, dual Weber IDF 40's
1978 Riviera Camper. Bone stock GE 2.0L F.I.
1979 Super Beetle convertible.
... as it turns out, it was the coil!
- SlowLane
- IAC Addict!
- Location: Livermore, CA
- Status: Offline
Re: Type 1 Mechanical Fuel Pump Inlet/Outlet
Well, the consequences of getting it wrong are pretty benign. You'll just crank and crank and wonder what that bubbling sound is coming from your fuel tank.
'81 Canadian Westfalia (2.0L, manual), now Californiated
"They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance."
- Terry Pratchett
"They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance."
- Terry Pratchett
- ruckman101
- Lord God King Bwana
- Location: Up next to a volcano.
- Contact:
- Status: Offline
Re: Type 1 Mechanical Fuel Pump Inlet/Outlet
I can attest. While the fuel pump on Bertha Bus feeds the bottom spigot, and pumps to carb out the top, it's the other way around for the fuel pump on Gretchen Ghia.
New engine wasn't getting gas until I swapped the lines. Listening for bubbles was less than definitive, fingers over the spigots and cranking not real clear either. A chunk of fuel line on the top spigot and a cup of gas to drop the line in and no bubbles but a spurt out the bottom spigot made it clear.
Now we be good.
neal
New engine wasn't getting gas until I swapped the lines. Listening for bubbles was less than definitive, fingers over the spigots and cranking not real clear either. A chunk of fuel line on the top spigot and a cup of gas to drop the line in and no bubbles but a spurt out the bottom spigot made it clear.
Now we be good.
neal
The slipper has no teeth.
- dtrumbo
- IAC Addict!
- Location: Mill Creek, WA
- Status: Offline
Re: Type 1 Mechanical Fuel Pump Inlet/Outlet
Yep, last night I hooked up my starter switch and turned the motor over a couple of times to see fuel out the bottom nipple. Now to set fuel pressure. Two gaskets are giving me 4 PSI. My Weber guru sez it needs to be between 3 and 3.5. Now I need to make another gasket.
- Dick
1970 Transporter. 2015cc, dual Weber IDF 40's
1978 Riviera Camper. Bone stock GE 2.0L F.I.
1979 Super Beetle convertible.
... as it turns out, it was the coil!
1970 Transporter. 2015cc, dual Weber IDF 40's
1978 Riviera Camper. Bone stock GE 2.0L F.I.
1979 Super Beetle convertible.
... as it turns out, it was the coil!