Date: Sat, 27 Jan 2018 18:09:14 -0800
Reply-To: Neil N <musomuso@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Neil N <musomuso@GMAIL.COM>
Subject: Re: Fuel Pump Relay/Fuse
In-Reply-To: <CAG12aisNa0S_qvo4Pff1RbK9Trt9acxavvpu7hs4J3VH_XtjSw@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Hi.
Not sure if your reply got to the Vanagon list; I only see my address in
header.
The fuel pump normally primes every time you turn the key to ignition on,
engine still off. If you do same in quick succession, pump may not prime
the second time but thats ok. It can't hurt to prime the fuel system once
its been opened but the van would eventually start if you didn't do that.
If you search thesamba .com Vanagon Vanagon image gallery, you should find
images of a cut open up OEM gas tank. On some tanks yes; there is a fine
mesh filter in tank. Maybe even two. Can't recall. Aftermarket tanks may
not have that screen. Fuel cavitation noise at pump can also be due to
clogged pre pump filter but I think you would've noticed if you had a pre
pump filter. Vanagons that came with that small square pre pump filter are
generally limited to 80-85 models. Bentley shows various fuel filter
configurations for various years and possibly even various states. e.g.
California. Can't recall for sure. IIRC, there were 3 different filter
configs for gas models. Pre pump filter only, pre and post pump filters or
just a post pump filter. The last is probably what you have. Of note, the
fuel pump has a screen inside it. If your new pump is still noisy, it's
possible your tank has a lot of debris and some got stuck in screen of new
pump. Check old pump for debris at that screen. Bentley shows procedure for
checking fuel delivery rate. Dropping the gas tank, flushing it out, then
replacing rubber grommets may suffice if issue is due to debris in tank.
Once its out, you can look inside and see if its rusting. Beware that the
grommet seal at top of each fuel expansion tank can fail and allow water
ad/or dirt into the fuel tank. It appears you may live in BC? VM Autohaus
in Burnaby BC usually has or can get fuel tank "reseal" parts. They're a
very Vanagon aware shop. If you need to replace the grommet at fuel
expansion tank(s), be careful with the white roll over valve. They are
available new though. Likely only from US.
On Sat, Jan 27, 2018 at 4:50 PM, Rick Cooper <rickdcooper@gmail.com> wrote:
> Yes its a 2.1 WBX.
>
> Thanks guys, that was really helpful. I hadn't lost power; I just didn't
> expect that the fuel pump would cut out after about 5 seconds. I'd always
> assumed it cut out when it reached full pressure and since I didn't have
> anything connected when I first powered it (i.e. the swapped-in fuel pump)
> on, I assumed I'd lost power to it somehow. Got my son to turn the key
> while I listened close by and sure enough it powered on for a few seconds
> before cutting out. Which I assume means that you need to turn the key on
> and off multiple times to prime the system after replacing the pump or
> filter.
>
> As for my fuel tank blockage, could this be anything other than
> rust/sediment/crud? I assume there's a screen at the bottom of the tank
> that becomes plugged with this stuff. Is the only solution replacing the
> tank?
>
> Thanks, Rick
>
> On Sat, Jan 27, 2018 at 2:47 PM, Neil N <musomuso@gmail.com> wrote:
>
>> I wrote:
>>
>> > Bentley should show location of relay in index at beginning of the
>> diagrams ....... There should be an image in Bentley Digifant section
>> showing which of the 2 relays is the fuel pump relay. That section should
>> also show how to bypass the FP relay for testing purposes.
>>
>> Sorry. I don't see that info at index to 1987 diagrams. P. 20.29 shows,
>> for testing purposes, how to bypass the FP relay so pump will run even if
>> engine is off. That page and 24.48 show which relay is for fuel pump. Oddly
>> enough, i don't readily see a page showing location of the ECU/FP relay box
>> but owners manual might. Anyhow.....
>>
>> Neil.
>>
>>
>>
>> On Sat, Jan 27, 2018 at 2:34 PM, Neil N <musomuso@gmail.com> wrote:
>>
>>
>>> Bentley should show location of relay in index at beginning of the
>>> diagrams but the fuel pump relay is located inside the black box above the
>>> ignition coil. There should be an image in Bentley Digifant section showing
>>> which of the 2 relays is the fuel pump relay. That section should also show
>>> how to bypass the FP relay for testing purposes. There may be specialty
>>> relays that have internal fuses but relays aren't designed to act as fuses.
>>> (unless they fail in which case the circuit to pump would be open). AFAIK,
>>> non of the Vanagon relays are fused internally.
>>>
>>>
>>>
>> --
>> Neil n
>>
>> Blog: Vanagons, Westfalia, general <http://tubaneil.blogspot.ca>
>>
>> 1988 Westy Images <https://picasaweb.google.com/musomuso/New1988Westy>
>>
>> 1981 Westfalia "Jaco" Images, technical
>> <http://tubaneil.googlepages.com/>
>>
>> Vanagon-Bus VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>
>>
>
>
>
> --
> *Because **I want my vote to count.*
> *And I want my neighbour's vote to count too. *
> https://secure.fairvote.ca/en/bc-referendum-vote-pledge
>
>
--
Neil n
Blog: Vanagons, Westfalia, general <http://tubaneil.blogspot.ca>
1988 Westy Images <https://picasaweb.google.com/musomuso/New1988Westy>
1981 Westfalia "Jaco" Images, technical <http://tubaneil.googlepages.com/>
Vanagon-Bus VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>
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